I think you won't be able to find anything that will be of any reasonable quality. They all cut corners and just add as many mediochre features as they can to make up for it.
Then again, not everybody has room for a flatbed scanner and additional printer.
I just feel if you are going to spend money, you should go ahead and get something that will do what it does well. But if you think about it, these multi-function machines do nothing well. They can only scan regular sized papers. They are injets (at this price range at least), so their copys will be inferrior to all but the worst traditional copiers. Finally, they have nowhere near the quality that a similarly (or even half) priced injet would have.
That said, my father has one. It is a laser printer which actually has decent quality, but in that office he also has a copy machine, printer, and fax machine all of which he still uses. Actually the only thing he uses the multi-function thing for is to print out faxes that are recieved by the computer....He only bought it because it was the equivelent of a cheap laser printer (he got a good deal on it).