EGW makes a good one, so does badger.

Here is a link to the EGW 20 moa base at Midway.

EGW 20 MOA Base Rem 700 Short Action

I would guess EGW would have one in stock so you might want to try contacting them. Their customer service is great. A lot of people are running these EGW bases with Burris XTR rings with good luck. I run the EGW/Burris set up on my Savage 12 in 223 and I like it.

All of my Rem 700's are Badger bases with badger rings