Better control arms?
 

At what power level do you need them?
With pretty much only basic bolt-ons should I just have somone box my stock lowers?

If you're going through all the effort to remove them, it just doesn't make sense to NOT replace them. There's alot to be said for "over engineering" things. Not only that, you'll be amazed at the performace gains the $250 will give you!

http://store.summitracing.com/defaul...t=SUM%2D790000

How important is it to change both uppers & lowers?
I see where a lot of guys only change lower arms which would be a much easier install, BTW I already have urethane bushings top & bottom

My brother has stock uppers and pulls 1.33 60ft. They are not as important as lowers, however, I changed mine anyway, because I wanted too. You would be fine to just change the lowers.

Should I get the boxed or tubular type?
i.e. BBK vs. Summit's, the latter are cheaper so does it matter?

The summits look nice enough. You can try X2cMotorsports as well. I am running HPM Motorsports. They are a little pricey, but kick major aszs!:cool:

you dont need them, save your coin for soemthing else.