Spock's Beard is great. I was turned on to them about 15 years ago & was sad to see Neal Morse leave, but they've done some great albums since.
There's an ultra-obscure band called Plastic Overlords that have only done 1 or 2 records, but they're one of the best prog bands of the last 20 years, IMHO. Check them out if you're at all a fan of classic prog from the 70's; they use the musical vocabulary of lots of the classic bands but make it totally their own...