There's a series also by the guy who does Honor Harrington Series, David Weber, with Steve White that’s very good. The Harrington book are basically Horatio Hornblower update in space, and it’s a chick. It about 12 books if you count all the supplementals.
Amazon for
<a target=new href="http://www.amazon.com/exec/obidos/tg/listmania/list-browse/-/1CTCQFHO6QUK1/qid=1084567088/sr=5-3/ref=sr_5_3/103-5822094-0877408"> Harrington Books LINK</a>
Steve White & Dave Weber – these are huge space warships battling it out, its also a series so get them I the right order
Amazon - ALL LINKS
<a target=new href="http://www.amazon.com/exec/obidos/tg/detail/-/0671318489/103-5822094-0877408?v=glance"> Shiva Option</a>
<a target=new href="http://www.amazon.com/exec/obidos/tg/detail/-/0671877798/ref=pd_bxgy_text_1/103-5822094-0877408?v=glance&s=books&st=*">In Death Ground </a>
<a target=new href="http://www.amazon.com/exec/obidos/tg/detail/-/0671721119/ref=pd_sim_books_1/103-5822094-0877408?v=glance&s=books">Crusade </a>
<a target=new href="http://www.amazon.com/exec/obidos/tg/detail/-/0671721119/ref=pd_sim_books_1/103-5822094-0877408?v=glance&s=books">Insurrection </a>