Although I have never used any of the Vintech stuff it is generally considered quality gear by the pro audio community. The models you metion are 1073 clones, and Vintech makes some of the best 1073 clones around.

The 737 is a good pre, but probably the worst offering from Avalon IMO.

If I were you I would get a Great River MP2NV.

The Vintech stuff is just like the the real thing and I would much prefer it over the 737 anyday of the week.