Here's another example of an overtone-like tone through the RW&B speakers. Notice how the high end really spanks when you hit it with pick and fingers unlike the 1265 speakers...

Yes, I have a EVM-12L in a combo amp with my Overtone.  This is my preferred speaker.  I've compared it with a Vintage 30, a Greenback, an Eminence Red Fang, and a Celestion G12 Classic Lead.  I did add my own version of a beam blocker in front of the EVM-12L.  You can hear it on my sound clip on the website if you wish.

Greg

I think Greg's clip on the Ceriatone soundclips page.

The right speaker(s) for an amp is very important.  But it seems there is often not as much investment in the cabinet woods and how the cabinet is finished. 

I think there is somewhat of a parallel here between amps and guitars.  The strings and the pickups of a guitar are integral to the sound produced, but the wood and the finish on the wood can enhance or cancel certain tones or frequencies.  The character of the woods and how they are joined also contribute to the amount of sustain in a guitar. 

I think the same is true for amplifier cabinets.  The amp components and speaker are integral to the sound produced, but the wood and the finish or covering on the wood of the cabinet also play a significant role.  The speaker is mounted to wood that will add or subtract from the tones the amp and speaker are producing.

I strongly prefer a hardwood cabinet for several reasons:
1) the tone is much better in my opinion.  (This would not apply to a head cabinet of course).
2) I believe there is more natural sustain from this type of cabinet if the woods are joined correctly.
3) Hardwoods are much more beautiful than tolex.
4) Tolex and other coverings absorb tone and sustain.
5) Tolex is not very durable.  It tears easily if you bump your amp into something.  It can be repaired but often there is a blemish remaining.
6) Hardwood (like flooring) is very durable and doesn't dent easily.  It can easily be refinished or touched up if dented. 

What do you think about hardwood vs plywood and tolex?

That's a very nice looking cabinet.  Did you make it yourself?

(I tried to attach pictures of a couple cabs I built, but the files are too large.  I'll try to scale them down.)

I just had to drop a note after reading all the comments. Thank you marin and zucker for your great clips!
I just received my Overtone and thought I had the ultimate speaker for it - an Alnico Tone Tubby. It has been doing wonders with all my Fenders and Class A amps. When I paired it with the Overtone, it took me a few days to dial it in. The Fender-y mild breakup tones are great - very tweed somehow. But the OD isn't that good. Don't get me wrong, sounds really good, but not (IMHO) as good as some of the tone's in the clips. Ultimately, its kind of turning this wonderful versatile amp into a one trick pony.

As for a new speaker, my money went on the G12-65. Sounds exactly like what I'm looking for (thanks marin). And to me, yes the high highs are rolled off, but the clean tone still sounds stellar! This amps seems very bright to me. With the Tone tubby, I have the treble and presence on 3 and its still jangley and bright.

I looked at the eminence website, but they need a speaker "wizard" like the Celestion site. Too many choices. But to my ears, the Hot Texas sounded great -well rounded. I wonder how it would sound with this amp. If not for the G12-65, that would be my second choice. Thanks again everyone for the info.