Prople always tell you that trying stuff is nice to get the feel, but ultimately I'd choose a platform that is common, has readily available parts, and has the reliability.
If I had gone with what I thought looked cool, I would have bought an mp5, if I went with what I thought felt best, I would have gone with a G36. Ultimately I started with an M4 and stuck with them for the very reasons I mentioned. My only non-m4 is my Scar-L which takes the same mags and internal parts, for the most part.
Go with what you want, but remember m4 variants are easiest to get parts for, pouches, mags and basically everything else. I think I'd go M16 DMR route if I was in your position. Just exercise trigger discipline and try using real-cap mags.
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