25 gallon should be fine for a baby. I don't think that's too big at all as long as you have enough hides. (3-4)
The Jumpstart Hydrofarm works good, there are better more expensive thermostats, like the Herpstat, which I'll be switching to soon. They are more reliable and last longer. They are around $100 for a single outlet one I think. Check out spyderrobotics.com to find out for sure.