I'm still getting a feel for what best suits me before going out and buying a rifle. Plus, I need to sort out UKARA and stuff first. From the games I've played so far, I tend to be settling into a stealth/dmr role. Not quite as long range as sniper, but even with the hire M4s I've been using, I don't think I've ever felt the need for full auto once. So, I think I need to start looking at a semiauto dmr - maybe if there's an HK417, or MK11, that can be upgraded to fire .30s at 350-400 with decent accuracy.
I have an idea of a DMR setup that would work well in the sites I play at - MK11/M16/HK417 type, adjustable stock, foregrip/bipod combo, 4x ACOG with either mounted mini RDS, or a fullsize RDS on a 45 degree offset rail mount.
I think I'm probably best off still playing a few more games in different places until I'm sure, then having one made to spec with custom internals. And I can always get an inexpensive CM16 raider or something like that as well for when things call for a bit more close quarter work.