For anyone researching a decent cheap midi keyboard with 76 keys, a pitch bender wheel and a modulation wheel, take a look at the Casio WK-1630. It is on sale now (in December) at Guitar Center I think for about $279, and it includes a power adapter.
I discovered this keyboard is very similar, and possibly exactly the same to a Radio Shack keyboard MD-1700, Cat.#: 42-4046
I think the only difference between the two is the brand name printed on them (and possibly the Radio Shack version doesn't include the power adapter).
The Radio Shack version is more expensive ($349.99). However, Radio Shack has a PDF manual online for their keyboard which you can download for free: http://support.tandy.com/support_games/60916.htm
I couldn't find a downloadable manual at the Casio web site at all, so the Radio Shack manual link is really helpful.
Just thought any budget-minded keyboard people might want to know about this deal, and the downloadable manual.