What is a Nikon comparable with the Canon EOS Rebel T2i?

The T2i has

- 1080p (30 fps) video recording
- 18 mp CMOS sensor
- Retail price 699 USD body only

I would say the D3100

Nikon D3100 has

1920 x 1080 (24p): 24 fps (23.976 fps)
1280 x 720 (30p): 30 fps (29.97 fps)
1280 x 720 (25p): 25 fps
1280 x 720 (24p): 24 fps (23.976 fps)

You can forget about pixel counts. Http://www.kenrockwell.com/tech/mpmyth.htm

Retail price $699 with 18-55 mm VR lens