Before you buy that Music Hall TT (not that I have anything against them), check out these sites:
http://www.kabusa.com and
http://www.garage-a-records.com . Several choices there, as well as other accessories you'll need.
See, 78s are more complicated than just getting the speed right. You'll also need a special stylus (needle) that's made for them. Trying to play 78s with a normal microgroove stylus will sound awful, and do damage to both stylus and record. (Exception: some of the REALLY late Little Gem and Golden 6-inch 78s are microgroove. You won't do significant damage playing these with the 78 stylus . . . it's playing the older ones with the modern stylus that causes trouble.)
Most phono cartridges do not have a 78 stylus available. One very popular one that does is the Stanton 500, since there's a British company (Expert Stylus) that makes every sort of needle you could possibly need, just for that cartridge. (If you collect pre-1925 records, you occasionally run into "special cases" with weird needle requirements.) For Disney collecting purposes, any cartridge with an available 2.7 or 3 mil "78" stylus should suit you fine.
You'll need a tone arm that allows you to change the tracking force--78s need more force due to the wider grooves.
And to really do it up right (not to mention expensive), you'll also want to consider finding some way to correct the non-RIAA equalization used on pre-1950's 78s, and to reduce the surface noise which unfortunately gets even worse after the equalization correction. The sites above sell all sorts of gadgets (of varying utility) to do these things and more. They are not necessary to enjoy your collection, though--I got along OK with just the tone controls on my amp until last year.
My personal setup is an old Dual CS-5000 Turntable (one major problem: no variable speed for my pre-1925 discs), a Shure V15-VxMR cartridge for the modern records, a Stanton 500 cartridge in a separate headshell for the 78s, and an Esoteric Sound Re-Equalizer to handle the equalization issues. As for the surface noise, I just put up with it, at least until the money tree out back sprouts a new crop. 9_9
A couple more pointers: 78s are very fragile, very heavy, and a pain in the butt (and back) to move--I speak from recent experience.
They intensely dislike getting wet. If a dry brush simply will not get the gunk off, a wet cloth may be employed, but let the record dry for at least 24 hours before playing. DO NOT use any sort of record cleaner on them unless its manufacturer swears on his ancestors that it's alcohol-free and totally safe for 78s. Alcohol, even in minute amounts, will destroy shellac 78s, and many record cleaners contain alcohol. And even with a proper 78 record cleaning fluid, that's a 24 hour drying time or you'll be sorry.
Be careful with those bound 78 albums . . . it's VERY easy to snap off a chunk of the record in the crack next to the binding. It's best if you can take the records out from the top rather than risk turning the sleeve "pages."
Before buying a 78, always check carefully for hairline cracks--they will shorten the life of your stylus. Invisible cracks can often be rooted out by thumping the record gently and listening for any weird rattling noises. Some 78s--especially Columbias--are made in layers (like ogres?) and may be cracked on the surface even though the record itself is intact. These surface cracks are just as bad for the stylus. I'm not saying I never bought a cracked 78. Sometimes you find something so cool that it's worth risking having the tip of your $65 needle go sailing across the room.
There . . . that ought to get you started. If it sounds like 78s are a pain in the butt, well, they are. Why do you think so few of us still collect them? Good luck.
