The only correct decisions is the one you arrive at yourself. You need to find somewhere you can play these instruments.
We often get Tyros 2, 3, 4 and PSR 910 in PX for Audya's and SD5's. Whilst the Yammies are not my cup of tea I would probably choose a Tyros over a 910. I just cannot see why people pay so much for 910's. I have yet to hear or see a 950 though.
If your on a budget, Tyros 3 is falling in value real fast and we try and get rid of them as quickly as possible, 3 months ago we could get £1599 for a nice one, now £1200 tops. At Pakefield one of the dealers was selling p/x'd Tyros 1's for £299 with stand and speakers.