Let them play together and mix it up in practices and matches this first year. Eventually, people will decide for you who they prefer to play with and you will see what works well.
You said you hope to come in somewhere in the middle of the league this year, so just mix it up and have fun in the beginning. After a month or so, you should have more info on which to make your decision. Ask your players how they liked the pairings each match. And of course, take it with a grain of salt, some people always blame thier shortcomings on "bad partners". These people usually lose no matter who they play with.
Last edited by Ace; 12-21-2006 at 05:10 PM.