Please suggest a pair of 12" speakers for my Traynor BassMaster 50W.

Hi guys, this is my first post here (if you don't count the one in the "introduction" area.)

I'll start with a gear question and end with a bit of a personal note, if anyone cares to read that much.

I used to have a mid 80s "Canadian edition" of the JCM800 50 watter, it had the JMP-style metal toggle switches on the front panel and extra internal fuse protection on the circuitboard (CSA mandated apparently).  I also had a 4x12" Marshall cab with original made-in-UK Greenback 12" speakers but I found that the amp sounded really stiff and sterile unless I had it dimed and that's not something that I usually get a chance to do.  The amp sounded great when cranked but I got this bright idea to sell it and now I'm thinking that that was probably a mistake.

I do however still have a 50 watt 1970 Traynor YBA-1 BassMaster head (with old Sylvania 6CA7 power tubes) which is basically a close cousin to the Bassman/JTM45 type of amp.  When hooked up to that Greenback 4x12 Marshall cab, it actually nailed old-school Marshall better then the JCM800 head that I now don't own anymore.

I found a used 1x12", Peavey 112SX closed back cab which has a Sheffield speaker in it.  I had heard good things about this speaker but I'm starting to think that I should get something else to do justice to my Traynor BassMaster head.

A 4x12 cab is just too big for me to transport, so a 2x12 cab would be more practical.  I liked the Greenbacks a lot but I"m not sure if a pair of Greenbacks would handle the 50 watts from my Traynor head.  I seem to recall that the Greenbacks are only rated 25 watts each, so they might be on the verge of frying when hit with a full fifty watts.  Am I correct or could the Greenbacks hold up in this application?

What the heck, if I see a used 4x12 Marshall cab going cheap, I might just buy it anyways and just use it in my house and get a smaller cab if I decide to play out.  Just looking for suggestions here.

BTW, I've been on the Joe Bonamassa band wagon ever since I bought my first JB CD four or five weeks ago.  I started out with Dust Bowl, then got Black Rock and finally, The Ballad of John Henry.  I didn't know much about this guy Joe Bonamassa but I had a good feeling that he's one of those guys that doesn't put out crap albums, and I was right thankfully.  His music is worth every cent.

If you read this Joe, thanks for that beautiful tune "Bird on a wire", it actually moves me to tears when I hear it! 

Last night I went out and bought the Black Country Communion CD (this is for my wife to give to me as my birthday gift to myself next week.)  I thought that since I'm turning the big 50 next week, I could get myself something really big and splashy like a new amp, etc... but as it turns out, my son turned 16 two weeks ago and I had to blow all of my cash on a bass guitar and bass amp for him, and now I'm broke!  8^)

Oh well, I have lots of gear already, just looking for more toys, you know how it is.