I'm not a huge huge fan of Weber speakers. The better lines they provide are good, but some say they lack sparkle and character. That is, when other speakers are termed "brittle" the Webers might be termed a bit "soft". The bluesmen seen to like them for medium volume playing, where the speaker itself is not breaking up.
There are two sleeper speakers, one still made - the Eminence alnico 10 and 12 inch. The 10's are still made. These are a 25w speaker, with a medium cone stiffness, and once broken in have a fantastic tone, closer to the old Jensen alnico than either the "too soft" Weber, or the "way too brittle" modern reissue Jensen (which is Jensen in name only, made by Sica in Italy). Check eBay and you can sometimes find the Eminence Alnico Legend 10's new for $39 each.... or less! This is the speaker Fender used in the Bassman reissue, and the speaker that gave that amp a terrible reputation in the beginning. In todays "need it now" world, folks failed to break in the speakers adequately, and were not happy with the bottom end. Trust me... trust me.. Trust Vic108. Once you play these the bottom will blossom out and give you rich deep low end.
Another GREAT speaker is the V12-30 Celestion, no longer made but you can find them. This is a more "American" sounding speaker, that is, it has less of a mid range rise than the typical Brit-toned speakers from Celestion. Think of it as a hybrid 60w speaker, good for quite a lot actually. It has a deep low end, and a sparkly top that is free from brittle tones after just a little playing to loosen them up. I've used this on 5w Champs, and it works wonders even at that low volume.
Similar, but a bit nicer actually, the Vintage 30, another 60w hybrid tone speaker. The V30 has a little less rise even than the V12-30, and is a great speaker in your Fender 2x12 or even 1x12... or 4x12 cabinet.
If you can find them - the Electro-Voice EV-FORCE 12's are "the poor man's JBL". These are heavy cast structure speakers, with nice smooth and sparkly top end like the JBL had, and low end response to 40cycles. Yes Four-Zero 40. Amazingly tight, not boomy, not agressive, just totally "there" and transparent. This is a jazz players fantastic toned speaker, with tight bottom... transitioning smoothly through the mids to a sparkly and well balanced top.
Dont discount the clean-toned Celestion Neo magnet speakers. These kick major major butt. I mean MAJOR butt. A bit different than either the Brit classic or American classic tone.... I'd call them another very transparent speaker, a bit uncolored and balanced. Almost like a sound reinforcement speaker. This is another good jazz speaker, or for steel guitar too. I can see country players liking it as well Now here's the kick butt part - they are ubber-loud. I mean beyond. They have the highest SPL of any speaker made for guitar. At 102db, they given an effective wattage doubling of volume. That is, a guitar amp using a 99db speaker (still considered an excellent SPL) would have to have twice the wattage to deliver the same volume as the amp using the 102db speaker. Most "OEM and off the shelf" speakers are about 95-98db speakers. A three dB gain is what you get when you double the amps wattage. It is the threshold of perceptible volume change.
JBL D120 (grey) or D120F (orange for Fender) are not hard to come by. Finding an original is hard, but then again, get the beater, expect the recone, and you're all set. Factory equal cone kits are available for JBL speakers, no problem. Once coned up, your JBL will sound like a NEW JBL, and need some breaking in to smooth out. I have no reference on what that takes.... but I'd imagine its the usual moderate volume, for 5 hours or so before things really smooth out.
This breaking in thing - you can play bass thru your speaker, and a volume that does not break up at the speaker.... and break it in in an hour or so of playing. Guitar takes longer, takes more volume to loosen up the surround and spider, and soften the cone.