steve,

you should be aware of a (very) important factor: the construction and keybed quality. yamaha is great with styles, if you like the approach, but the key feel can really draw you back...
G70 on the other hand is as heavy as a tank, but quality is different alltogheter.

there are "in between"s:
roland e60, korg pa500, used pa800, used tyros, and some others.

my advice: get into a store, stay there and test for two-three hours, make a decision, go back after two days, revise or strengthen your decision and then buy!

goodluck!