That printer would be much more accurate than a reprap prusa mendel or a makerbot (which is essentially a reprap but almost assembled and twice as expensive). SL is just a much more accurate way of 3D-printing. For sure in these small affordable printers.
Here is the difference shown between FDM(Fused deposition modelling) and SL(Stereolithography):
I myself can't justify paying that much for a SL machine for private use (even if it is considered cheap), so yeah that's your own choice
I'm building a prusa mendel right now, which is cheaper than a makerbot or the one you mentioned, but putting it together is something you either want to do or not. I pay around €22 for one kg of filament, ABS or FLA (that's about $28,5). So material wise it's cheaper I guess, but I wouldn't say for sure that you'll have beautiflly finished keycaps unless you finish them yourself afterwards (sanding, filing, etc..). But then again, the qualilty you get out of your own built machine lies entirely in ones own hands ^^