if you look at rjskateworks or other online stores there are only the 03 and 04 frames that are made for pmi markers.you can try ebay for the old maco storm frame but there junk.the old 02 frames are not made any more but you may be able to find them on ebay.another trick is to buy a pmi vtl there around 50-60 online and have a e-frame.just take it off and keep the rest for spare parts or sell the parts off and make your money back on the body.
www.firstcallpaintball.com has a piranha eforce vf for like $65. Buy it and keep the eforce frame and put your mech one on the new vf and sell it for like 40 or 50 bucks. My teammate just did this on his Piranha STS, works great.
Yes, go with the eforce vf. I would wait and see if you like the trigger already in the eforce frame before buying the blade. If you decide to get the blade I would have a proshop or someone experienced put it in because I put my own in and wish I would have let the proshop do it because it was kind of a pain and it didnt fit right at first. As far as the bolt, I've heard good things but never actually used one.