Mostly I use "target_enemy_near" which I bind to tilde (~) key.
Well until last night, now I bound "insert" to "target_friend_next" and "delete" to "target_friend_prev" - although if I ever figure out what the - and = keys are called I'll prolly move those two there.
But my fav thing, which I only thought of yesterday, is I have now bound "target_enemy_near" to the c, n, and t keys. Not because I felt I needed four keys for "target_enemy_near" but because now I can't accidentally hit like say the n key and my nav bar is gone, or the t key and lose my target window. Muwahahaha.

Thank you, drive through.