Best cordless phone system for office?

Okay, so since I'm finding phones with good reviews in some places, not so good in others (basically a mix all across the board) I'm not sure quite what to get or where to find info and look. We need a 5.8 GHz cordless phone, multiple lines is NOT a necessity, with caller ID, and a good battery life (9 hours min) and good range. The one complaint from different people on different phones seems to be the range - for some reason I've come across two different reviews for phones that state something along the lines that the phone has only a 15 yard range (and mind you these reviews come from different people and are almost the only bad review to the good ones). Suggestions/thoughts/opinions?