G&G SR25 is good, whack an M120 in and you're away
Ares SR25 is a nice bit of kit too, quick change gearbox and the EFCS from the amoeba series. Bit more money though.
The Krytac SPR isn't really a DMR per say, just a long AR. I mean, put an m120 in and you should be golden, but it doesn't look like a DMR without a .308 size mag.
The HK G28 is awesome, bang on out of the box, just a LOT of money.