It's not HD but the Canon SX120is is probably one of the best choices you can make for $300. Canon PowerShot SX120 IS Digital camera reviews - CNET Reviews

I have the SX110is.

If you have a nice, large SD card you can take lots of video and it's fairly good quality. The still camera is great and takes wonderful photos. Runs on simple double A batteries which is very convenient and with rechargeable NiMH batteries very affordable. The Manual mode lets you control shutter speed, aperture, ISO, WB, and more.

If you are on a budget this is probably your best choice.