The LGA 2011, many of them, offer 8xDIMM slots. The amount of RAM really depends on the 'project' size and complexity. Say you got 32GB (8X4GB), you can create a RAM Disk and place the project in the RAM Disk (8GB~16GB) and on some projects greatly reduce render times. Further, most Adobe products allow you to have a 'scratch disk' so simply make it a 'RAM Disk'.
I know Maya likes cores, and the LGA 2011 offers the 6-core/12-thread i7-3930K. Some benchmarks - http://www.tomshardware.com/reviews/core-i7-3930k-3820-test-benchmark,3090-7.html
GPU vs CPU, it depends on how you render, most folks in your situation it's a mostly about the CPU for the output and GPU for the 'screen'. If you have a larger budget then you can look at the MP LGA 2011, the E5's recently became available - http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=100008494%20600303512&IsNodeId=1&bop=And&Order=PRICED&PageSize=20
So 16-core/32-threads is an option. Recent review by Chris - http://www.tomshardware.com/reviews/xeon-e5-2687w-benchmark-review,3149-8.html
Therefore, IMO 32GB and 6-core i7-3930K on an ASUS P9X79 WS - http://usa.asus.com/Motherboards/Intel_Socket_2011/P9X79_WS/#specifications