hey mate, not sure if you can find a nice series 2 r33 for under 10k... but get the one you like the look of better... you can rebuild your S14 or get a R33 (Series1?) with mods, really depends on what you want, if u want a change etc...
Not too sure about S14, but the Skyline has been known to have better build quality than the Silvia platform - the engine / gearbox is pretty tough as far as i know
just as a added bonus, the RB doesn't sound like a fart can