some keyboard advice please

[OneWingedAngel]

I want to learn to play the piano, so I'm looking at getting a keyboard to start me off. I'm considering the Yamaha psre 303 and 403 models - anyone have any experience or advice to help me make a decision? Also are there any good sites/books that could help?

 

[OneWingedAngel]

88 key models seem a little much as a starter, the plan is to learn the theory and get some practice on a smaller keyboard, and then go for something more serious later - I wouldn't want to spend serious money now incase I don't stick with it or can't find enough time. Is there any disadvantage with starting with a 61 key model?

The 203 has neither pressure sensitive or weighted keys.
The 303 has pressure sensitive keys, but is not weighted.
The 403 seems to be an uprated 303, but still is not weighted.