I also enjoy David Weber's and Eric Flints novels.
You might like Sharon Lee's and Steve Miller's Liaden Universe novels.
The following link is to an omnibus which includes the first two novels in chronological order - they are excellent space operas.
http://www.baenebooks.com/p-1448-the...variation.aspx
There's also David Drake's Republic of Cinnibar Navy series - the first novels are in the Baen free library:
http://www.baenebooks.com/p-469-with...ightnings.aspx
http://www.baenebooks.com/p-258-lt-l...ommanding.aspx