Please don't use your money on L85A1 MOD.
I bought it for permanant after using it for a few tiems (like 3 times) because I thought it was awesome, great for tapping, but horrible at medium and close ranges. Trust me, the G36E is a lot better. The old reviews that have been out for 5months+ for it are actually outdated because it's spread got nerfed and is nearly as bad as the AK 47 now..
Uhm, really, I don't have to time to explain why cause I'm off to bed real soon. But if you're into ARs, M416 CQB for medium/long; REC7 for close; and M6A2 for a hybrid versatile between them (M6A2 won't do as good as the other two, but it's probably the best if you don't plan on carrying both of those weapons around). As for SRs, you already have the DSR Subsonic, all I'd recommend now is a M107CQ SE.
What the ideal backpack in my view is: M6A2-SRT(with ACOG), M4 Super 90, M107 CQ SE and TPG-1 Pro or DSR SubSonic.
Edit: Considering you have an AN-94 (good for CQC), MG36 (another CQC gun), and a DSR. I'd say get a M416 CQB or M6A2-SRT (depends on wether or not you like iTechs, or ACOGs) for medium/long(ish) ranges. If it ever gets too hard, you always have your DSR up there to help. Another sniper would be M107 like I said, and the M4 Super 90 as a CQC.. but I wouldn't get that because you have 2 CQC weapons already. You really should've gone with the M21E instead of MG36 though... the recoil pattern guarantees 30-40% headshot.