Some upgrade Questions... AMD system videocard / monitor

Current Build

     MSI 890FXA-GD70

     Sapphire 5870 2gb

     AMD Phenom II X6 1090T 3.2GHz

     16gb Corsair Vengeance

     2x Crucial M4 128gb Raid 0

     ABS 1050w PSU

Looking forward to the new battlefield 4. I would like to play the game with some very decent settings. Currently I have a 23" 1080p monitor. I am looking to upgrade the monitor as it is a crappy cheap acer. I would like to stay in the 23-27" range 1080p. I don't think 1440p will be cost effective for another year or two. Monitor wise and videocard wise.  Also my big question is the video card. Battlefield 3 I believe had suggested requirements of a 6950. I never played it on pc so I wouldn't know how my settup would preform. Battlefield 4's specs have yet to be released. But I'm thinking it may be leaning towards 7950 as its suggested videocard. So I guess my question is do I a.)just pick up a 7950/7970  b.) hold out for the next generation radeon HD cards. or c.) pick up another 5870.  If i were to go the crossfire route i would be losing 1gb because there is no way I am going to dish out $200+ on a 2gb 5870 on ebay. The 1gb versions go for about $100. As for the processor I think it is fine. I will attempt to OC it if it is an issue before i upgrade. For those who don't know the 5870 and 6870 are almost identical. In fact benchmark wise the 5870 pulls ever so slightly ahead. Atleast on cpubentchmark.com So don't think of it as a 2 generation old videocard. 5xxx series were the last of the ATI cards. 6xxx and up are AMD brand.

Could try BF3 to get a feel for the performance - 48 hour pass:

https://onlinepass.battlefield.com/

Budget for upgrades?

$300ish. Not for both a monitor and graphics card. I also would like to go crossfire in the future. The ATI to AMD re branding pretty much screwed me on xfireing my current set up. That and bitcoin mining at the time. So I'm not sure if i just go 7870 now because it is cheap and go xfire when the new series comes out. Generally from my experience the xx70 series is on the market longer after an upgrade then the x950/x970's. 

good call i was pissed when i missed the $9 sale

on battlefield 4's site they list system requirements as coming soon link. But on origin's site they list it as a 7870 /gtx 660 link. Hmmmm.