What's the cheapest-but-still-good DSLR with HD video?

[cfusionpm]

The Nikon D3100 is currently one of only two DSLRs (D7000 being the other) to include any kind of usable autofocus in its video mode. But that being said, the cheaper of the two only records mono sound and has no external mic inputs, which means you will pick up every sound your lens makes as it auto focuses.

 

[hcnypeter]

I would recommend you buying Nikon D5000 Digital SLR Camera.The Pentax K-x is also the cheapest DSLR with HD video,it can be had for under $650.I have used this one.