I'd personally try to get my hands on a bred doe or two. Moving a doe in milk is a good way to seriously hurt her lactation as her entire life and management changes in one day - they're biological animals, not machines, and that often delivers a big punch to a lactation. Too many buyers complain about poor milk production after the sale and then blame the seller for lying - so I don't sell them as does in milk hardly ever. I think buying a doe bred (confirmed if possible), allowing her to adjust in the last few months of pregnancy to your mangement, and then having her kid at her new home sets her up for success the best.
Many herds have realized they kept too many doelings that will be FF'ers because they're nice - then realize before kidding they're going to have too many milkers. Or, a more mature doe matures out of usefullness in a herd when you have several sons and daughters out of her and you have lots of interesting prospects up and coming. Many herds have a size limit and will sell outstanding does worthy of being a herd foundation for this reason.
Of course doe kids are the most economical and you can always get them straight out of phenominal animals for a reasonable price. But, the won't be producing milk for you for about a year and there are some kid management issues I see time and again that leads to problems - #1 being coccidiosis stunting, followed by a close #2 of nutrition failure.
Finally, MANAGEMENT makes all the difference. The first few years are huge learning curves, usually only done when things go wrong. You can't know what you aren't aware of, but that's where forums like these allow you to read about the problems of others and how to prevent them. Not to scare you, but poor management can ruin whatever genetics you bring home. IMO, if you're going to feed them, I think buying the best you can afford is a good idea so they have the most chance of giving back what you want out of them. But, they are also a bigger investment possibly lost in times of mismanagement.
One thing MORE THAN ANYTHING I would like to stress to all new goat owners is PARASITE MANAGEMENT. It is not as simple as deworming them willy nilly. Dewormers are only a small facet (and a WEAK one at that!) of parasite management. And, coccidia are very different from stomach worms. All of these parasites ABSOLUTELY REQUIRE adequate management - again, of which only a small facet is deworming. If you improperly deworm or overzealously deworm, resistant parasites will rear their ugly head on YOUR farm faster than you could ever imagine, and animals will die after an extended illness and unthriftiness. Hate to be so melodramatic but as a vet, every sheep and goat call I've seen in my young career has been... parasites. Before I was a fully accredited vet, this was also the case as a mentor to new herds. DO NOT let your new 'clean' ground and ungrazed pastures lull you into a false sense of security - I don't know how many new herds have fallen into the trap of 'we don't have parasites' because their first year or two see few issues simply because herd size is small and pastures are pristine. No goats are clear of parasites and unless your pastures are incidentally set up perfectly, you keep herd numbers small, and you end up with highly resistant stock (unlikely) you will see parasite troubles if you're not diligent.
I implore you, do some reading on wormx.info - which is a research based, producer oriented literal goldmine of information from around the globe.