Mate personal preference for the A-5 or Spyder selection i would go for the spyder. Reason being is that the parts are available widely and the custom upgrades are made by many.
They are easy to maintain and if kept right with a few tips they will run forever. Still got mine after nearly 2 1/2 years and its still running fine. Incorrectly maintained ones would of rusted or died by now
Also, you being in the US i cant really give you any links for stuff, we pay hella loads of tax over here so its like the total cost plus 17.5% of that total cost on top. So we get raped basically if you pardon the expression
So have a look around and i suggest
http://www.pbnation.com/forumdisplay.php?s=&forumid=193 as there is a for sale section on there where you can pick up markers at bargain prices and their is surely got to be an Impy on there.
Hope this helps.