I've got the Domino and the vac (ct36). They are expensive, but they do outperform even the 6hp Rigid.
If you read the supplemental manual for this it really helps too. I know your going to love this tool! Congratulations!
You can buy just the hose for the festool tools and they hook up to a standard shop vac or your DC. If you get the gray hose (non static dissipating) it is a bit cheaper too. Still, $$.
A cheaper method is to buy the Reducing Sleeve For D 27 Hose Product No. 487071 for $18. You will have to adapt it to a hose (it is for the 27mm hose which is like 1 1/8") that you can probably get at Homers for less than the adapter.
Dust collection is a must as you noted! Pretty soon everything in your house will be domino'ed! It's deff a fun tool!
That's not even a smile! That's just a bunch of teeth playing with my mind!