The Rampage is for quad SLI/CF applications. If you plan on having only one or two graphics cards, the Sabertooth would be fine and save you $100. If you wanted to save another $100 go with the ASRock X79 Extreme 6.
With this budget, you need a top quality air cooler. Think Noctua NH-C14, NH-D14, NH-U14S.
As for ram, depends on your applications, just get four modules. I would get low profile with no heat spreader so any cooler will fit. Probably 16GB minimum. Most any brand would be nice.