Anyone looking at hexcore vs quadcore processors?
If a hex core is able to boost half its cores when needed, then I like them. Otherwise, they are mainly for multitasking, rather than gaming. Fortunately, both AMD and Intel have some form of boost on most of their new processors. You should also note that AMD and Intel aren't able to be compared directly by clock speed. Intel tends to be better at the same clock speed in my experience, but AMD has higher speeds at lower prices. AMD are easier to upgrade, due to the more standardized AM3 socket.. AMD chips are also a bit easier to overclock in general, but Intel has a handful of chips that are easy to OC. AMD is at a bit of a disadvantage for OCing though, because they run a bit hotter. In general, I prefer AMD for gaming rigs, and Intel for most other applications. Because you're looking for a 3d modeling computer, I would probably go for Intel.
But anyway, I would compare a quad core's speed vs a hex core's boosted speed, and get the higher one.
Graphics card choices are a bit harder to put in a nutshell, as there are a lot more variables. The first thing I usually look for is a GDDR5 card, and then compare how many bits each card I'm looking at has.
Also, there are no hardware recommendations for Brink what-so-ever, as the code is still being optimized. But, if you make a gaming rig, it will be able to run it. You don't need to be worried about specific recommendations. Any computer you build is going to have better specs than the consoles.