4 Stars is good.. from those with 4 stars, try to pick one with a decent bitrate file... I never d/l anything less than 128 bitrate.
But the higher the bitrate, the larger the file.. I think 192 is pretty decent, but do prefer higher if I can get it
Choosing someone who has a faster speed than yourself is no problem.. but you can only d/l from them at your maximum. If you choose someone slower.. you can only d/l as fast as their maximum. Does that make sense ??
A thing to remember tho' the faster ones tend to be targeted and you could be queued longer.. so you might get the file quicker if you go for something slower.