If you are willing to shop around and drive far, Yes you can find a decent turbo 5sp for 3500. And for your other questions. These cars are very solid aside from headgasket and other minor issues. There is lots of info on this fix and all the others youll ever need. If its not blown already all it takes is retorquing the bolts and it should last in stock condtion for a lonnnng time as long as you run good gas(92 or more). Just make sure the one you buy doesnt leak power steering fluid, thats about the only major mechanical issue ive seen on more than one car. The rubber boots rip off, The seals get dirt in em and wear, And the fluid starts to drip. And other little stuff breaks sometimes, like the speedo, the interior dome light, and the alarm goes bad, But with this forum and a little time its all easy to fix. These are very easy to work on cars. The parts are relativley cheap, And there is a lot of supra parts on ebay if need be(spare part-out parts, brakes, shocks, stuff like that). And a turbo supra will def be faster than a maxima
Ive beaten a stick and auto maxima, The 3 liter ones, in my na 5 speed supra. And a lot of cars lol.