As has been asked, is the budget you mentioned for guns alone or do you need to factor in other kit, such as eyepro/boots/vest etc.
If it's just for your gun, if I personally was starting out, knowing what I now know from years of playing, I'd consider the new DE range of M4 variants, they look good, & all player reviews so far indicate good performance & features for the price.
To that end, you could technically afford TWO, I would definitely recommend getting two, maybe a nice long version, backed up with a compact stubby variant, then you've always got a mag compatible backup, as well as suitable guns for woodland or cqb sites.
Edit: i saw your post after typing mine, great minds think alike 👍😉