Blofeld is 100% digital. Mine's busted right now though, gotta send it in for repair and I haven't the cash right now

The resonances on the Blofeld when you tweaked the filters could be EXTREMELY thin/harsh, however, if you have a Blofeld you shouldn't be asking it to do Analog style noises, that's not what it's for. It does really great pads and sound effects, leads/basses are pretty meh on it. It's a very psychedelic sounding synth, the mod matrix is fucking nuts on it, I loved playing mine. I could get lost in it for HOURS if I smoked before-hand...

Truly the weirdest sounding synth I've ever had the pleasure of programming. It has it's ugly side, though, build quality is crap, the onboard effects are (And I'm not even exaggerating) the worst I've heard of any synth -Ever-, hardware or software. I cannot stress this enough, they are BAD. I have no idea what they were thinking when they made them. The reverb sounds like you're adding white noise to the background, the phaser is so synth you hardly notice it. The delay is probably the best thing on there, but it's kinda hard to fuck up delay, haha.
I have thought about external filters most definitely, and if I had some extra cash I'd so buy some! I just need to rethink my whole gear setup really. Right now for hardware I've got
Spectralis 1 (Main HW synth)
Akai Miniak (Sounds almost identical to a nord lead 1, but fatter and less "Cutting/defined") very versatile too, awesome for how cheap it is
Blofeld (Temporarily broke)
Really though, the problem with all my HW synths is that the interfaces are terrible. The Miniak is pretty much only programmable via software, otherwise you have to scroll through countless menus, although it's laid out pretty decently and there's short cuts to get around, editing just takes WAY too much time. Thinking about selling it and getting an Ion instead, same engine, better interface. I think it has slightly less polyphony and less FX, but the FX aren't great anyways so no biggie. If I don't get the modular, I might just get a Nord Lead 3. Amazing interface, really bright and cutting filters, only problem is they aren't very versatile.
What I'd like instead ( I'm definitely keeping the Blofeld though )
Nord Lead3 or Nord Modular 1 or 2
A vintage analog for nasty acid leads/oldschool filter
Yamaha Motif Rack (Sounds amazing...Never played one though)
Mf-103 phaser
It's true Infected's studio is expensive as fuck
now, but most of the music I like from them (Let's say 2004 and before for sake of argument, even though I liked a few songs on Vicious Delicious), it wasn't too pricey then. I think most of what's on those CD's was Nord Modular, Nord lead 1/3, Roland V-Synth, Reaktor 5, Omnisphere, and some hardware reverb/phasers. I know they use the MF-103 phaser and it sounds amazing, but it's $300. Classical Mushroom is done entirely with a Nord Lead 1 and a Nord Modular 1 if I'm not mistaken, and it sounds really good to my ears. Very organic, not too processed.
I'm definitely not giving up on Reaktor and Omnisphere. Reaktor has potential to do some really crazy shit. I particularly like the FM noises you can get out of it, and it has formant capabilities so you can make trippy vocal patches too. You'll dig it for sure man, it sounds really nice, albeit complicated. It sounds like the "Converting vegetarians" era of Infected. Omnisphere though, honestly, I think is mainly good for the samples it provides, the synth engine is powerful too, but like I said, those filters man. Just throw me off. I do like how thick everything sounds in it though, and everything seems "Colored" so you can make some really beautiful noises. The onboard effects in it are fantastic too, for the most part. The EQ's in it are just great. I have another free VST EQ and it just doesn't come close. Alchemy has the best delay I've ever heard though. I'm going to see if I can just use it's delay as an effect for other synths. Other than that though, Alchemy is pretty disappointing in terms of sound quality, to me anyways. It sounds...Boring. The sound just doesn't seem to have any flavor, you know? I think Camel Audio should stick to making effects.
I'm definitely leaning towards getting the Modular, it's just so much more versatile than anything else I own and it sounds awesome. I know it'll cause me a lot of headaches programming though, and right now all I want is something I can just GO with, you know? So I might opt for the NL3. We shall see!