Avatar is a great suggestion, as is UP... excellent color saturation there. Ratatouille and Cars are also great animated transfers for showing off colors...
So what projector did you end up with? I tried to live with a lesser projector after letting my Infocus 777/135" Firehawk combo go a couple years back. I tried to live with the LCD cheapies... I saw 10 minutes of the JVC RS25 and had to have one. some of the best money I've ever spent in the hobby. It's a dream to calibrate and the picture is stunning... Every time I fire it up, even the better half comments on how great the picture is now.