Is there a Nikon DSLR with comparable HD Video quality, and price, to the Canon T3i?

I would just go ahead and buy the T3i but I have extra lenses from an older Nikon DSLR that would be very useful for videos and would save me money in the end.

Yup, it's the D5100, pretty much the same thing as the D5100.

However, make sure those lenses have AF-S in them, otherwise you will have to focus manually! It's still though.

Here's a DSLR Buying Guide - http://www.the-dslr-photographer.com/2009/11/which-dslr-to-buy/

Yes go for the Nikon D5100.It is almost the same price as the T3i but has many more features. I can compare the two in detail for you.

Advantages of the Nikon D5100 over T3i:

1. Significantly lower noise at high ISO 1 183 ISO vs 793 ISO
2. Much better image quality 80.0 vs 65.0
3. More dynamic range 13, 6 EV vs 11, 5 EV
4. Much less startup delay 500 ms vs 1500 ms
5. Better color depth 23, 5 bits vs 22, 1 bits
6. Has in-camera HDR Yes vs No
7. Video autofocus Contrast detection vs None
8. Larger sensor APS-C 23.6x15.6mm vs APS-C 22.3x14.9mm
9. Longer battery life 660 shots vs 440 shots
10.Better boost ISO 25, 600 ISO vs 12, 800 ISO
11.More focus points 11 vs 9
12.Smaller 127x96x78 mm vs 133x99x79 mm
13.Slightly more lenses available 169 lenses vs 162 lenses
14.Slightly less shutter lag 273 ms vs 283 ms
15.Shoots slightly faster 4 fps vs 3.7 fps
16.Cheaper 4 990 kr vs 6 471 kr
17.Slightly thinner 3, 1" vs 3, 1"

The only thing the T3i has and the D5100 does not is a built-in focus motor which Auto focuses with all auto focus lenses. Still D5100 is the better choice.

Best price for D5100 from what i found:
http://www.amazon.com/...004V4IWKG/

Read this review from a user about the overall performance of the camera:
http://www.amazon.com/...LR8A4H60T/

Best price for T3i from what i found:
http://www.amazon.com/...004J3V90Y/

Go for Nikon D5100
Exact same sensor and processing abilities as the D7000. Some of the best Image Quality available in any DSLR. ISO 3200 is very usable with low noise.
- Swivel screen while the D7000 is fixed -- Since the contrast autofocus (ie Live View) is not very good on either of these cameras this is not really a player unless you are using a tripod. Then the swivel screen is very useful.
- 4 fps vs 6 fps for D7000 - No big deal 4 fps is plenty fast to fill your card with similar looking pictures. Also, in RAW D7000 buffers out pretty fast and then slows down anyway.
- 11 focus points vs 39 for D7000 - Most of the time not really a big deal. Sometimes all those extra points get in the way and slow you down.