After posting my reply earlier I did a little bit of research and came up with a couple of ideas.
First being using Shimano both front and rear. Something like the BR-M375 and a BR-T610 in the rear. This wouldn't be too expensive either. I already have a wheelset that is both disc and rim brake compatible that I recently took off my Jekyll and is currently sitting idle, plus I have extra 160 and 180mm discs came with the wheelset.
The better option is using TRP Spyke dual piston caliper for the front. TRP also makes a dual piston cable actuated hydraulic caliper as well which sounds like fun.
Finally there is the good old full hydraulic Magura route. I really like the stopping power of the Magura MT Thrity calipers I have on my Jekyll. So something like the MT Sport two piston for the front and and HS 33 rear hydraulic rim brake for the rear.( this sounds like the most FUN).
Even if I do not go this route on the Delta V.. It is more than just a passing thought to do it on the '94 Super V frame that I am picking up in the next few weeks.. I really want to build it up as a more "top end" build, within the limits of the what the fork and and frame are capable of handling of course. That bike is already getting Velocity Cliffhanger wheelset w/ M525 hubs that are capable of both disc and rim brakes. I just haven't decided on which color black vs silver I want the wheels in.
Hmmm, I think I just figured out what I am going to do with the fork.It makes the most sense to just rebuild the existing Headshok for the Delta V and keep the Fatty Ultra as is and use it on the Super V. I can go the crazy hybrid Magura disc/rim brake on that bike.
edit: I am as bad as my late wife on deciding on a plan!