Just a suggestion;

Between the Tyros 5 and the Genos, get the Genos. Unless, as you say, the price is holding you back. If so, and you can find a Tyros 5 at a much better price than the Genos, get it.

Between the SX900 and the others (SX700, PSR-975/775, Korg or Roland), get the SX900. You won't regret it.

This is just my personal opinion.

Whenever I've spent for the best, I've never regretted it. However, I've regretted not getting the best many times.

Hope this helps.