Castle moving sale

[OptimusV6]

One quick question about the motors. I recently finished a nitro convertion of a savage and I basically have a stock savage flux with the 2200 motor. I also have a hot bodies Lightining Pro 2 EVO buggy without a motor. I just thought that I could put the 2200 motor on the buggy and get a lower kv motor for the flux, as it is a heavier vehicle (and the prices of the castle motors are very nice right now!). Should I get the 1512 or the 1518 motor? Both are 1800kv, what I'm not sure about is the 1.5 turn vs 1 turn difference. As additional information, I may change to a XL chassis down the road, but right now the flux will remain mostly stock. Also, I am currently running in 4s with stock gearing, but I have a high speed idler on the mail as I want to gain more top speed.... I believe that with a lower kv motor my top speed will decrease, so a higher count pinion may be necessary. Thanks!