What type of diving do you wish to use them for (Cave / Openwater) ?
I have used a Vytek before and from a purely personal point of view I don't like the small display, it's hard to
read at a glance, I prefer the Aladin Series of computers (Smart Pro) they have a large clear display and the information is there in a clear easy to see format, oh and they are pretty tough too.
Stu.