I can understand the basic desire to get the best that you can, but it also doesn't make any sense for me.
I have spent too much money in my lifetime on electronics and then upgraded when something newer came out for that slight bump it gave, but looking back it never really amounted to much.
I had an old Windows PC with the SandyBridge i7-2600 and it was significantly faster than my older AMD processor. After 2 years I replaced it with the newer and faster i7-3770 and to be honest that .1ghz made zero difference.
I bought the i7 riMac that is .5ghz faster still, and performance wise you can't tell the difference. The screen is fantastic, and it's a mac so the OS works better and that was the main reason I bought this machine, but considering there has been 3.5 years and two complete chip design changes, but the performance improvement is only on paper, and not something that is really that noticeable.. I can't perceive in my day to day operations a 1-2 second improvement.
The reason to get the riMac is for the screen. No other reason, and I doubt that the next itteration of intel chips will make that big a difference that you will actually perceive an improvement over what is currently out here.