If you are going to wet mount and you have the space, I would go to Ebay and pick up a drum scanner, they go for Epson money. Other than that the Nikon coolscans will beat the cheap flatbeds.
My ideal would be something like the Eversmart range of A3 flatbeds, a bit to much money at the moment, with them you get speed ease of use and top quality.
The cheap flatbeds like the Epson/Micrtotek quote high dpi, but in reality you don't get anywhere near that in captured detail. In fact I did see a test somewhere where you actually captured more detail at 2000dpi with them than at the "full" resolution. Get a Nikon.
Kevin.
The Microtek I use is a dedicated film scanner. I do get more detail out of it at 4000 dpi than 2000 dpi, but the time penalty is absurd.
I think it is important to note that all of the home solutions are compromised to some degree. For anything really important I send it out for a drum scan or, gasp, I print it in the darkroom. I can't (and won't) spend four hours making a "perfect" scan, then four more hours retouching. Its possible to reach the pinnacle of scan perfection with wet mounts, but is really tedious. I think for up to 16 x 20 a 2000 dpi scan from a dedicated film scanner is just fine, for people.
That being said, perhaps buy a v700 and try it out. It might work for you. If not, you have a good flatbed for scanning polaroids, prints, flat art, invoices.