I found when buying my last dog a pup on Main register was very hard to find. Main register is where they can be shown at dog shows and bred from so their pups (if bred to another main registered dog) can also be eligable for registration (either main or limited)
Limited register dogs can be bred from but their pups can not be registered.
I think the whole idea of limited registration is to still recognise the dog is pure but not of the standard you would wish for in a breeding prospect or show dog. Heaps of thing will make breeders deside weather they are limited or main register such as hernias, a good/bad mouth, colour, markings etc. Some dogs on limited rego are worthy of main registraton but for what ever reason the breeder has decided not to have it on main registration.
I found some breeders would not sell anything on main register (I guess out of fear of the new owners eventually breeding a better dog then them and winning in the show ring or fear that their dog which carries their stud name could jepodise their name or popularity if it was bred and produced not so outstanding pups which in their rego papers will carry their name also know as prefix)
The difference in price is often nothing. Also I found alot of breeders who had bred an outstanding pup that was expected to do well in the show ring would not sell the pup to someone without a show history but rather to someone that can help the dog reach its full potential in the show ring (and get their stud name out there). These pups don't come up very often and usually when they do they keep them themselves or sell them to someone else in the dog show circuit.
So basically if you want to breed from your dog or show your dog then look hard and be prepared to pay a good price for one on main registration but if your after a companion, family pet/member etc then limited registration or no registration will get you a fantastic pet if not a better one as they generally aren't at as great a risk of some of the health problems the pedigrees are known to have/develop
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