Most of the tumblers we see associated with reloading are the very lowest level in quality and durability. The true market for tumblers is in gem polishing and jewelry making. The tumblers that professional jewelers use are generally larger capacity and higher quality than we are used to seeing at the gun shop.
The one vibratory tumbler that is aimed at reloaders that is also professional quality is offered by Dillon Precision and comes in two sizes, BIG and REALLY BIG. These, as well as all vibratory machines, are meant to be used with dry media -- typically walnut hull and corn cob. These do a good job of polishing the outside of brass cases in preparation for reloading them.
The other category of tumbler, as Dick has mentioned, is the rotary tumbler. The Thumbler AR-12 is one of two good ones to consider. The other is the RCBS Sidewinder. The rotary tumblers work with wet media, which is a ceramic or stainless steel media that is run with water and detergent. This category of tumbler will clean and polish the inside of the case, primer pockets, as well as the outside of cases. These can be used for all reloading but are favored, in particular, by black powder shooters who want the inside of the cases to be cleaned of fouling along with making the outsides of the cases clean for reloading.
None of the recommendations I've made here are cheap. Rather, they are the best Values in terms of performance and durability.
Most of us limped along for years with an amateur tumbler and called it good. When the second, or third one of those burned out, we ponied up for a quality tumbler. Those who have used the Dillon, or Thumbler, or Sidewinder would not go back to the cheap models. I know I won't.
What you probably should be advised to do is contact Dick Dastardly and let him set you up with a wet tumbling system. You won't be sorry.