You'll have good flow that time of year, even if the snowpack is a little low. I've done most of the runs on your list, drop me a line if you want some specific beta. I'd also recommend the new Colorado guidebook - it's the bomb (but i'm a little biased
Whitewater of the Southern Rockies
Clear Creek will have some good aerobic warm-up / acclimatize runs if it isn't too hight that early in the season. Dumont has an awesome play hole, but I'm not sure if it is at a good flow that early in the season.
Pretty funny to see all these other C-ville boaters on the 'buzz.
Some of us are going to Goshen this Friday if you wanna play.