Slothy and bomber
If you check out terb, you'll find Jenn is well reviewed and regarded, but has never been classified as GFE.
My personal favourites have been:
Serena - http://www.leafdriving.com/Serena/Index.html
and
Sorel - http://sorelsondrio.com/
Have also received GFE service from Nadia at Cupid's Candies. She looks a lot like Alanis Morissette which I know would not be everybody's thing, but I found her attractive.
There are also a lot of reviews at TER thereroticreview.com, not free, but could be well worth a few bucks spent in advance.