The liquivision X1 is the most streamlined computer. It is also quite easy to use and has a nifty digital compass, so that's one additional instrument you can get off your arm or wing.
I also own two VR3s and have had mixed results with them. One of them had to go back to the factory (in England) four times in about 18 months. The last trip back seems to have done the trick. I do know of others who have had similar problems --apparently it was some issue with a batch of depth transducers.
One big difference between the X1 and VR3 is power. I like the X1 because it is so easy to read, small, lightweight and elegant. Just remember, the X1 has to be plugged into a wall outlet for recharging. It has an internal battery, which is great but also requires the additional step of making sure you grab it prior to each dive. That should not be a big deal, but it is a consideration you need to add to your dive preparations.
The VR3s use 3.6 Volt AA batteries (which can be a little difficult to find, especially in remote locations) so you can just leave them in your dive gear.
If you are buying a first time computer, the X1 really is something and it is what I would choose. Pesonally, I prefer the X1's internal battery which I am told is rated to last 10 years.
Overally, I prefer the X1 over all the other computers you mentioned. It is easy to master, no moving parts to break, pretty much indestructable, smaller, lightweight and by far the easiest computer to read.
Jeff
