>>Would you say the V700/750 is just as good or better then getting the nikon coolscans?<<
No way. Flatbeds typically have no focusing capability. They're preset to a given position, and assume the film plane will be there. It works, sometimes. They compensate for focus differences by applying digital sharpness. Nasty.
The Coolscans (and most higher-end film scanners) focus on the surface of the film itself. The film holder, even the non-glass-based ones, are pretty good at keeping the film relatively flat. All bets are off on slide-mounted film, as you're only be able to focus on a given area and film curvature will knock the rest out of focus.
Hi res scanning can be a double edge sword, especially with negs. Unless you do multi-pass scanning, you're going to get noisy scans, regardless of scanner used. Scanning negs at high res CAN be useful in in single-pass, but only if you interpolate down to a lower res after optimizing your image. Interpolating down smooths out the noise. So scanning a neg at high res has it's uses.
Unfortunately as mentioned here the Coolscans are no longer in production, so you'll have to go used if you want one. The only available new scanners are the Plustek-style units. I don't know how well these work, but they don't appear to be horrible from what I've read.
All this of course depends on how many images you intend to scan. If it's only a handful, then sending out and paying whatever may suffice, you'll have to add the total up for the scans and see if getting something like a Plustek may be a better route to take. If you have a lot of image then having your own film scanner is a must.