What do want your (current or future) camera to do for you? What I specifically mean by that question is - what kind of output do you need?
I'm a pro wedding/event photographer (check out the new studio in this
thread ) and shoot with a Nikon D2X as my primary. My partner shoots with a Canon 1Ds Mark II as his primary. Our equipment matches our needed output. We have the cash reserves for me to upgrade to the D3 and him, the Mark III, but the bottom line is that they're not going to increase our profits. I've become very familiar with both brands and they're both outstanding. In the end (as was mentioned) it's the glass you own that will limit you. Having fast primes or zooms with a fixed 2.8 can do a lot more for you than a new body. Again, I have to ask what your needs are in regard to output.
As far as a Canon with HDV capture, if $2700 is within your budget, there's no way you can go wrong with the
EOS 5D Mark II. But this is probably more camera than you're looking for in regards to a D90 equivalent.
Pretty impressive specs though:
21.1 Megapixel Full-frame CMOS sensor, 14-bit A/D conversion (16,384 colors/each of 3 primary color), wide range ISO setting of 100-6400 (expandable L: 50, H1: 12800 and H2: 25600).
Full HD Video capture at 1920 x 1080 resolution for up to 4GB per clip with HDMI output for HD viewing of stills and video.
Next generation DIGIC 4 Image Processor for faster processing of fine detail and color reproduction as well as reduced image noise.
High performance with 3.9 fps continuous shooting, new shutter with a durability of 150,000 cycles and improved weather-resistant body.
Live View Function for stills (Quick, Live and Face Detection AF modes) and video.
3.0-inch Clear View LCD (920,000 dots/VGA) monitor with anti-reflective and scratch-resistant coatings for improved viewing and smudge protection.
Updated EOS Integrated Cleaning System specifically designed to work with a full-frame sensor.
Compatible with over 60 Canon EF Lenses and most EOS System accessories.