The problem with skimping on a bag purchase is this:
No matter the size or the quality, you'll always wish you had purchased more of both.
I currently have the Technifibre Pro ATP Monster. It may just be "the cadillac" of bags, but i still wish there things better about it...........but it's hard to beat. (i don't need bigger, just want even MORE organization options and this bag is already pretty good in that aspect).
Microgel Radical MP (5), Cheap 16g Gut/ RedDevil 1.19 - 56/54# (among other setups)