I much prefer playing a piano, but living in an apartment makes that hard. I'm not sure I can use my Crate with my Korg and get the sound I want. I'm also looking at buying a Korg SV-1 so I need to consider that as well.
Pair of near field monitors. Google that and you'll see loads of suggestions. I've recommended PC speakers as a cheap option on your other thread - before I saw this post. Do a search on the Sound On Sound magazine website. Loads mentioned on there.