I'm looking for a new cheap cab to last me through maybe 6-12 months before I get a new one.

I'm torn between getting a Bugera or B-52
http://guitars.musiciansfriend.com/product/B52-LS412-400W-4x12-Guitar-Extension-Cabinet?sku=600486

http://guitars.musiciansfriend.com/product/Bugera-412HBK-200W-4x12-Guitar-Speaker-Cabinet?sku=502590

anyone who has used either of these, or used either of these brands, let me know which you think would be better.

Playing through a Randall G3 150 watt head

Hey there. I own a Randall RH150 G3+ head myself, and if I were you I'd steer away from the Bugera cab. It doesnt sound as nice as most of the other cabs out there in the same price range.
What genre of music do you play?

if you are going for temporary get the cheapest thing you can get