Ceriatone makes a really great product for the price. I have never had any problems with mine and I crank the holy hell out of it almost everyday. Some people gripe about the trannies...if you are not satisfied with the tone of them drop some old vintage iron in there . I couldn't be happier with my HRM Overtone. I am anxiously waiting to hear it next to Ken's Carol Ann to see if it can even hang. You can check my youtube videos under the same name and let your ears be the judge.
It's been covered a lot but there are some great budget Dumble alternatives:
Pedals: Ethos TLE, Hermida Zendrive, Zendrive 2, Mosferatu, Fuchs Plush Drive, Jetter GSR, Menatone Howie, etc. You can get into the Dumble "camp" with a really nice tubescreamer type pedal into a loud clean amp like a Fender Twin, Super, or Dual Showman. I like a TS808 RI and Fulldrive II Mosfet.
Amps: The Ceriatone OTS is one of the cheaper options but as mentioned above think its a really great buy. Nik is one of the best guys to deal with in the biz. Even some actual Dumble owners on The Gear Page give them props (thats incredible because that place is home to some of the most rediculous cork-sniffers on the planet).
Brown Note offers really nice kits that are comperable in price to the Ceriatone stuff once you factor in the high shipping costs from Malaysia. Brown Note is USA stuff, has great forum support, and comes with instructions. If you are handy with a soldering iron I would recommend this route! I hear Moss is a super guy to deal with at Brown Note.
Fuchs is now offering Traynor, Fender, and Musicman mods into one of his ODS amps. As Ben has stated, they are VERY nice amps (only he has one of Andy's own models). Andy is one of the most knowledgable amp gurus alive and has been inside many Dumbles. Between Fuchs and Two Rock I don't think there is anyone out there doing it any better.
If you want to get your hands a little dirty and get the "real deal" the used market is as good as it'll likely ever get. I've seen Two Rocks at $2K, Fuchs even less, Brown Note builds completely ready to rock for $800...
Check out The Gear Page Amp Emporiums for lots of REALLY nice stuff for crazy prices.
'67 and '74 Fender Twin Reverbs, '74 Marshall 1987 lead mkII, Metro Superlead 100. Pedals from TC Electronic, Ibanez, Dunlop, BK Butler, Electro-Harmonix, Fulltone, Maestro/Gibson, Loopmaster switching, VoodooLab, Boss. Gibson and Fender guitars, Dimarzio pickups.