I do like Cool Rails myself! As far as my favorite single coil (I think its some kind of bucker, its noiseless) is a Lace sensor Blue! I love this pickup in the neck position! They could be found used for a good price!!
GOOD luck finding an affordable SC sized bucker that sounds good and has AlNiCo... AlNiCo isn´t strong enough in that size (about a 4th of a normal humbucker mag) to be really worth using, unles you´re looking for Ultra-low output..