CC Motors on sale! What gearing and cell count for CC 1518 1y 1800kv

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So...for those of you who dont know yet Castle Creations is having a huge sale on their overstocked motors (1518's and 1717 etc) for CHEAP! I picked up a new 1518 1800kv for the revo for 65 bucks , get em while you can!

Anyway what gearing and cell count should I be looking at to power this bad boy? I was wanting a lower KV motor as I plan to run my proline trenchers pretty much full time (except for speed runs). The tires are pretty big (6.9 tall , 3.4 wide).

I was originally going to run the 2200 on both 4s and 6s but since I got the lower KV 1518 I am thinking I may just want to run 6s full time????

I know the rule of thumb is lower kv = more torque so you can gear up for the speed you want. I was planning on buying 4 packs....Should I still buy 2, 2s and 2, 3s or just buy 4 3s packs?

Also, what would be a good place to start for gearing (on either 4s or 6s) for this motor/tire combo on the revo?

I dont need blistering top speed (45 would probably suffice) so not sure if 45 is too much for 4s or not?

Thanks! :)