Is the varminter barrel cromed?
I think all bushmasters are exept the DCM model.
I prefer crome-lined, but for max accuracy you should go stainless or crome-moly.
The rest sounds good, I would wait on the bipod. I like mine, but lots of people don't like them.
Try the rfle without it and then if you fell like you need it, get one.
Edited to say J&T has a nice kit for about $850 that has everything you might want.