$300 isnt alot to work with but... Bikes direct does have quite a few options in that price range.

their are a few disadvantages to this option:

*the bike is shipped to you partially disassembled. You only need to attach the stem/handlebars, wheels, and seat, no major install or special bike building knowledge needed, however you may need to bring it t shop for fine adjustments ($25)

*may need to pay shipping

*limited sizes. Did you know bikes come in different sizes? search yahoo (or BF) for determining your size based on height or go to a bike shop and let the tech tell you what size.

* being new, many people recommend buying from a local brick and mortar shop so you have "support". By buying online you forfeit this luxury.

listed here are the hybrids in your price range. make sure you check out the mountain and road options as well (categories listed across the top)

http://www.bikesdirect.com/products/.../avenue_fb.htm
http://www.bikesdirect.com/products/...se1_hybrid.htm
http://www.bikesdirect.com/products/windsor/rover1.htm
http://www.bikesdirect.com/products/...lite_sport.htm
http://www.bikesdirect.com/products/gt/gt_nomad_2.htm
http://www.bikesdirect.com/products/...kkingbikes.htm
http://www.bikesdirect.com/products/windsor/rover2.htm