If I had nothing from Armas and $200 I'd buy the following (all weapons are account wide)
3 Slot Oscar 2399
ISSR-b Dog Ear 1999
RFP-9 Fang 1499 (might get a nerf but whatever)
VAS R-2 Crown 2199 (because I like silenced guns, but you could do the 3 slot ntec as well)
Obeya CR762 2399 (or OBIR if you prefer the burst rounds)
OCA 2399 (or PMG if you prefer the slower fire rate)
Colby .45 AP 1499
6 Months Premium 2636 (assuming you're gonna play for a bit)
That is around $170. With the remaining $30 you could do joker boxes, vehicles, or clothing that you find appealing. I'd personally spend the money on guns since you'll use them the most. The guns I listed should allow you to be competitive in most situations.
Enjoy your spending spree.