Another option are the JR DS821 digital servos. They are supposed to be a bit better than the Futaba 3151's and 3152's (I own all three).

http://www.horizonhobby.com/Products...ProdID=JRPS821

The good news is that the DS821's come with the Spektrum radios. Lots of people who are buying the Spektrum radios want larger servos for giant 3D planes, etc. So, they are selling brand new sets of four DS821's on the 'Bay. I won four of them a few weeks ago for $59.99; that's $14.99 each.

Just search for "DS821" and you'll see a bunch of auctions.

David