i dunno. if you were to buy it for 25K from a private seller and do all the mods, then 33k is a pretty good deal, and its all done for you already. here in cali, 25k is standard private sale, 30k is usually dealership prices, and thats for stock cobras with moderate miles (under 50k). honestly if you had planned to do each and every one of these mods, and were going to not do it yourself (IE a shop do installs), you made one hell of a deal. sounds like you dont have the time to do such extensive mods so yeah, you made out great. your monthly payment will be a little higher (whats it, like 600-650$?), but you really dont have to mod anything, evar!
however, as with buying anything previously modded, i hope the mods were done to the fullest extent of quality and workmanship. IMO take it to a dyno first thing and make sure the tune is spot on, if not, retune to be safe. id like to know more about "fuel system upgrade" because that can mean alot of things, however likely its a BAP. Solid Rear, eh, great if you only want to go fast in a straight line.