i have the m-audio keystation 88es [semi-weighted]
it does the job for $200, but probably not if you're coming from a piano background.

you may want to check out the CME UF8 with Weighter Hammer-Action keys
and Aftertouch for more of a piano feel. they're around $500.

i think you're going to have to spend a bit to get something that feels like a piano, but for synths & light piano work, or for people on a budget a semi-weighted controller would work fine.

it's all about what you play with it, right?

nothing feels like a piano. mmmm.