~20000 BBs of PHX in my DB Custom 6.01 with 0 jams. They have .2, .23, .25, .28g BBs if you are concerned.
AE .2 (only white .2g)
KSC .2, .25....
Toytec .2, .25 (the .25 are supposed to be the BEST of all)
if you use high grade BBs the majority of brands work. Some don't, ie AE .25 and the AE black BBs, but I don't beleive the 6.01 barrel desire all the hype about BB jams. Go the the DB forums to check out more info on BB compatibility. Great choice, which brand?