You would be best to get some active nearfield monitors, but they cost quite a bit, and the cheap ones are pretty bad (<£125) so you would be looking at about £200 for a half decent set, but obviously are used for monitoring sound properly.
You would also be looking at a few £££ for software too. If you were just after keyboard sounds, then Steinberg's "The Grand II" is good which you get with Cubase 4 along with many other popular synths and samplers.
Either way, its gonna be expensive![]()
m audio oxygen 49 - £80
pair of rp5's - £230
emo 0404 - £70
sennheiser hd25sp - £70
£450, bit cheaper than £600although i am pimping my own kit
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I'm only after a keyboard to learn to play it, not mixing my music etc, although being able to record what I play is a bonus