I'd also recommend sticking with irons at first. Are you an experienced shooter? Do you know what to look for/avoid with optics?
I don't know that I'd recommend waiting until you're in CQB before you put on an optic, unless I'm misreading you.
Once you get more money and experience under your belt I'd recommend something like a Vortex strikefire or sparc. Lifetime no questions asked warranty. Even if you buy a used one, it's covered no questions asked. The only dot I'd rather have is an Aimpoint(at twice the price). I wish I could advise on an airsoft brand optic, but I've never looked into them. I have scopes and dots lying around from my ARs, so I use those.