you could try slivertongue uniq bow ( its like lvl40 req ) , it carried me from act4 to t15 maps ! ( you dont need to use fork support with that bow )
Was thinking about that as well, but figured I would lose too much dps going only phys as flat stats.
I ended up going with the Voltaxic Rift, and it performs really well. I've spent 159 ex in total on all my gear (plus around 40 on gems since I didn't have any to start with). I'm pretty much blasting through rare t15 maps (not super juiced yet though).
Will look into optimising the budget setup in a little while, when I learn pob.