Motor limits on esc's mean the limit and up not the limit and down. so on a esc with a 14t limit means you can run a motor from a 14t and up so this would include motors such as 19t and 27t etc but not a motor such as a 10t.
I would highly recomend the xrs ive had novak speedo's before and there top notch.
http://dcracing.co.uk/dcrshop/produc...roducts_id=478
Also in my personal opinion i would avoid mtroniks as ive had 4-5 bloe up on my cant remeber precisly they seemed to be going up left rigt and center.
Hope ive helped.
A