Yamaha PSR Styles for worship band?

by Steve
(Minnesota)

I'm thinking about buying a Yamaha PSR keyboard to replace an older Casio arranger keyboard that we are using in my church's contemporary worship service. All the keyboard person uses are the one touch styles settings on the Casio, and it would be the same for the PSR. We have 3 guitar players on our worship team, but no drummer or bass player, which is why we use the arranger keyboard.

Obviously the 510 would be a big step up from our current keyboard, but I'm wondering if the added styles on the 710 or the 910 would make it worth the difference in price to purchase one of these. Also, from what I've read, it appears that that the sound engines in the 710 and 910 might be better than the one used in the 510. But does the sound engine much affect the sound quality of the styles section of the keyboard, or does it primarily enhance the single instrument voices/sounds (which we don't use).

A while back I went to our local Guitar Center and checked out an older PSR 900, and observed that it had a lot of worship styles on board; but I see that the newer 910 seems to lack these. So I'm wondering if the worship styles that used to be on the PSR 900 can be downloaded off the internet and used on the 510, 710 and 910's, or are they unavailable due to copyright issues?

I guess the bottom line question is this, given our specific situation, can we get by with the 510, or would I, at some future point in time, wish I had ponied up the money for the 710 or the 910?