Just to clarify the 15 amp vs 20 amp outlet, it's pretty easy to tell them apart by just looking at the front. Looking at the front of the 15 amp outlet you will see the two vertical slots and the round ground hole. With a 20 amp outlet there is a small horizontal slot coming off one of the vertical slots. Do a google images search for 20 amp outlet and you will see what I'm saying. By code though you should only use a 20 amp outlet on a 20 amp circuit.
I have found 10 gauge to be a bit excessive particularly for the length of runs we are talking about in a typical house. It's very stiff and difficult to work with especially stuffing it into the wall box with the outlet attached. I used 12/2 Romex with my dedicated 15 amp line to two 15 amp outlets and it's been a very worthwhile improvement to my system.
I have found 10 gauge to be a bit excessive particularly for the length of runs we are talking about in a typical house. It's very stiff and difficult to work with especially stuffing it into the wall box with the outlet attached. I used 12/2 Romex with my dedicated 15 amp line to two 15 amp outlets and it's been a very worthwhile improvement to my system.