HEQ5 + ED80 (short tube for more portable) + Orion Miniguider is your best bet.
An ED80 will set you back around $1000 for a short tube. The HEQ5 still goes for around $1100 - you may be able to get one second hand.
The miniguider is $130~ without guide camera, $400 with guide camera.
I have just completed the above setup which i use for my nebula work.
I have a Meade 5000 ED80 (old scope, cant buy it anymore, pretty much the same as the 6000 series or Orion ED80) and my first test of this setup i got some decent results:
http://www.iceinspace.com.au/forum/s...d.php?t=100074
The HA is 5x 20min exposures and there is next to no trailing (odd top left corner, think the filter isn't sitting flat or something).
Not really in your $2000 budget mark, but if you can spare the $2500-$3000 for it, you won't regret it.