1/8 scale buggy conversion - help please!

[padailey]

First step... what buggy! I have a couple options so far...

1) Ofna Hyper 7 roller... I can get one for $100
2) Ofna Ultra ???? ... as of yet unidentified as to the exact model... roller, loads of parts, tires, etc... only used a few times -- $50 - $75
3) GS Storm .... roller minus shocks... price not set but probably around $50.

I know there are others but these are local and pretty cheap so I'd like to use one of these if possible. I "think" any of these would work but I'd like your opinions also. I have heard the 7 is a good conversion but I get more with the Ultra (assuming I can figure out what it is for sure). Would some version of the Ultra work ok and others not? I don't think I want to go the Storm route just because the LHS stocks very little GS stuff... but could get it if needed.

What is everyones opinion? One thing that may help in the decision is I want a 2 battery setup so I can hook up my 6 cell or 2S lipo in series and still use them in my other vehicles.

Thanks,

Paul