you've been given great advice from the folks here! I too, like pointing breeds, of which, I happen to have stumbled on and stuck with Vizslas. So, there's my bias! I have friends that own GSP, Brittneys and labs, and have hunted with them all for over twenty years.
Its awfully thrilling to see a dog lock up on point, and you walk up and up comes a bird, you let it get out, so not to hamburger it, pop a cap in its butt, the dog runs out and brings it back to your hand!
The flushing/retrievers require a bit more savvy from you, the handler, to read their signs of birdiness, where as the pointer is a sort of, "no brainer they're locked up, and usually that means action!
The pointing breeds are usually going to work out of gun range, whereas the flushers/retrievers MUST work within gun range.
Considering your desire to work the uplands mostly, exclusively, my nod would be to the pointers, but, in a lot of pheasant fields, the cover is such, that a flusher/retriever is more ideal, in dense cover, a pointing dog may be locked up, and you can't see it, that's why technology has included tracking devices, beepers and such!
I should be breeding my female Vizsla within in the next couple of days, and a litter of pups to be whelped about 63 days later, making pups available around the end of June or early July if my math is correct as I type!
Feel free to query me at your leisure through here, I have photos, pedigrees and four references from my first and only litter as yet!
I'm not a pro breeder, so no guarantees or other perks they can offer, but, my female has been OFA'd (good) and the stud will be certified soon, he's going to be three yrs old in June, he's out of the Rebel Rouser Lines from Nebraska, a fine dog, my girl has a hall of fame gransire, a dog named "Golden Empire's Dr. T" and she has other championships in her background.
I HUNT, no tests, no trials, just hunt, and have been hunting Vizslas for about twenty-five years, I've owned four now, and hoping for my fifth, a pup out of my girl. My best friend has had four also, and is the owner of the sire!
They are beautiful dogs, good family companions, when I bought my first two, my daughter was about two yrs old, my son about ten.
They'll demand your all, and they'll give their all!