What's the best AMD GPU on the market right now

Im looking to upgrade my build from this:

CPU:  AMD FX-8350 8 core 4.12 GHz OC

    Cooling: Corsair Hydro Series H60 Liquid CPU cooling 120mm fan

RAM: 16 GB DDR3-1600

GPU: AMD Radeon HD 7870 -2GB

MOBO: Gigabyte GA-970A-UD3 -- AMD 970

PSU: 650 Watt

HDD: 2 TB 64M cache 7200 rpm 6.0 Gb/s

OS: Windows 7 64-bit

Case: AZZA Armour Gaming Case - Red

Sound Card: Creative Labs Sound Blaster X-Fi Xtreme Audio

I'm looking for the best AMD cards available because I know my gpu's the bottleneck and the HDD so I was wondering what you were thinking. I'd like to keep total upgrades under $1000. Thanks

Wait for the 1st quarter of 2015 to see what AMD has in store, there's a lot of buzz going around with their R9 380x/390x.

Not to mention it should see the release of there new amdgpu drivers, which if you decide to give GNU/Linux a go at some point, you'll benefit greatly from these. (not the ops goals as far as I know, but you never know what the future holds)

right right now? 295x

If there is no major rush wait until they release there new GPU's; they should be out in the next few months. These GPU's have been said (by AMD) to be 20nm and should be a considerable upgrade of the current R series of GPU's. If you had to by one today I would STRONGLY argue you get an Nvidia card, they are just ahead at the moment in many ways. If neither of these are options for you then its the R9 290x if you want the best single gpu AMD card on the market. This is an excellent GPU, it just runs hot and loud and sucks the power down big time.

The one with the highest number

Its depending abit on how to definate the best gpu.

Single gpu or dual gpu?

Single 290X

dual: 295X2

Actually, the best single GPU for you is the...(suspense) r9 290x, DEPENDING on the model. The r9 295x2 is the best of dual GPU,  even better than the TZ, for less than 1000 bucks. You should get the XFX core edition model: I have heardnit has the best price to performance ratio.

 

I'd argue the 290. It is a tiny bit slower than a 290X but can be just as fast or faster with an OC and can be had for much cheaper. So I'd call it the "best."