Welcome to the Cafe Nando.
Your team is ok, but I think you have a little way to go before you challenge for your league title. Because its a 10 team league, expectations for players should be higher than normal 12 team rankings, and so you may not like what I am going to say.
Your Sps are pretty solid. Carpenter/Willis/Prior make a pretty good 1-2-3 and Sabathia, Cain, and Garland are solid 4-6 guys. No complaints from me about your rotation. I am not very high on Mussina and Liriano may not pitch enough to be worthwhile, but he very well could at the same time. You could definitely use at least 1 - preferably 2 more closers. I love Street, but Benitez is a pretty big injury risk - regardless, its smart to have a minimum of 3 closers anyway.
I dont like your hitters nearly as much as your Pitchers though. Again - in a 10 team league, I expect more.
Piazza - one of the worst starting Cs in your league.
Thome - again, there are at least 10 other 1B ranked higher than Thome.
Same for Ellis - he's at best ranked 7-12 this yr so the best you can get from him is someone below average for your league.
Wright and Cabrera are awesome - solid players.
I like Rollins as your SS - gives you some much needed SBs.
Wells is a below average #2 OF.
I am really not high on Floyd this yr and I have a hard time seeing him repeat last yrs numbres - a poor #3 OF for your league.
Green is a decent #4 (he'll probably be more valuable than Floyd).
GAnderson is pretty shakey to me.
Durham is a below avg MI option and Garret Atkins is similarly below avg.
Milton Bradly is just a poor UTIL option.
As for the people you mentioned being available on your WW, I wouldnt use my #1 Waiver priority on any of them, but if Kotchman or Kinsler get hot, you need to jump. The reason I ouwldnt use my #1 WW priority on one is because it's too important to waste on players that were not drafted. Wait until the first rd of waivers goes through- chances are some other team will drop a player that is more valuable than the playrs you have listed.
I wish you the best of luck and hope you have a great fantasy season.