EVGA Step-up, worth it??

So a couple months ago i bought an eVGA P55v motherboard, as i was on a budget and wanted to upgrade to an 1156 socket. I read reviews and looked around for other cheap, but reliable, boards, and reviews said this one was a good choice, but they never mentioned there are NO overclocking features on this board, at least for the CPU, i can adjust the memory, but i can only set it to it's standard speed (1600Mhz) since it's defaulted to 1333Mhz.

Anyways, my real question is, would it be worth it to use eVGA's step up program? (as opposed to saving for an Asus or Gigabyte board)i have a couple of boards in mind, but i really can't decide.

First is the P55 Micro (121-LF-E652-KR)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Next is the P55 LE (123-LF-e653-KR)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Last is the P55 Sli (132-LF-E655-KR)
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

What i'm looking for is stable CPU overclocks (i wouldn't mind getting to ~4Ghz), good chipset cooling, and ease-of-access to gpu release clip, sata ports, etc. and since it's through the step up program, i obviously won't be buying from newegg, so the links are just for reference. The first 2 (Micro and LE) are $70 and some change, and the SLi is $90. Would it be worth the extra $20 to go with the SLi?? I may use SLi in the future, but right now I'm planning on buying a GTX470 around Christmas, so i only need 1 PCI-e slot.

also, my current system is as follows:

CPU: Intel Core i7- 860
MOBO: eVGA P55v
RAM: 4GB(2x2GB) Corsiar XMS @1600Mhz
GPU: XFX GeForce GTS 250
PSU: Rosewill Xtreme series 750W
Case: Antec 900

Please give me any thoughts, comments or other ideas, it would be much appreciated,
Thanks.