Mmmm... Fresca.
First let me say that I'm not typically a "gear guy" but I thought I'd offer my advice. I'd say that tube is always better, and that 4x10's will give you more distinction and the 2-15'll give you give you more junk in the trunk window shaking bass. I have an Ampeg 4 x 10 cab with a solid state Ampeg SVT-350 Head. The head wasn't my first choice but my initial one was stolen and I needed a replacment immediately. This is big and loud.

My little baby is this little used 1972 Ampeg B12 tube amp with a flip-top head. This thing sounds amazing and is perfect for recording but it's a little quiet for most clubs. It's a little frustrating because it sounds so good. A good sound guy can put it in the monitors and let you hear, but a bad one will leave you drifting. All in all, it's a crap shoot, but since my band is going more accoustic it'll probably be loud enough.

If you want to check it out just let me know. 

<img src="http://home.myuw.net/oren/images/ampegB12Nporta.jpg">

I would recommend the Eden 410XLT cab.  If you're looking for more flexibility, combine the 410XLT with a 210XLT... the 210 is great for small gigs, and the 410 will give you the ability to push a lot more air for larger venues.  I know a number of folks who claim these are the best 210 and 410 cabs out there... and they are made here in sunny Minnesota!  (Make sure they are the "XLT" versions -- other designations have different porting designs which can sacrifice deep lows.)

I personally would not go with a 2x15 for CSNT stuff.  You will in general get a little better articulation with 10s, and I think that would lend itself to the band's sound a little better.  I used to play through 15s, and got great lows, but I found that I preferred the clarity I got when I switched to 10s.  Just my opinion, of course.  Many cabs with 15s and a tweeter can still get great clarity.

Head:  Of course, a vintage Ampeg tube head can't be beat.  Although I know a guy who swears by a Tech21 rackmount pre running through a solid state 1200 watt power amp.  (Something like that is a super-easy way to run direct to the board and for recording, but you lose some of your street cred.)  :)

I assume you've been to http://www.bgra.net/ ?

One of the prominent high-end bass dealers out there is http://www.planetbass.com/, also conveniently located in our backyard (MN).  Of course, you can get any high-end amp from them that you want... if it is made by Aguilar.  :)  Great selection of basses, though.  Speaking of Aguilar, people seem to *really* like their heads, but I have not heard them, so I can't say.  Maybe the best of both worlds?  Warm tube sound plus modern accoutrements?  Go down to American Guitar Boutique in St. Paul and try them out -- a great place to try out nice gear.

Ahh, gear acquisition syndrome -- my plague, my tormenter!

SVT CLASSIC ALL THE WAY!!!

For an interesting change of pace, check out www.earcandycabs.com- cool custom built cabs in Indiana. I think they load the Bass Bomb 2 X 12 with Eminence speakers.. ala SVT 8 X10. I just ordered one after trying a friends. This company rocks too! Not only did they talk to me about what I wanted but asked alot of questions about what kind of amp and guitar I usually use etc.

worth checking out. Good luck on your rig hunt and looking forward to playing with you @ the Entry.

haha...

If you can get your hands on the fender bassman from the 60s it sounds amazing. http://cgi.ebay.com/1964-Fender-Bassman-Amp-Vintage-Original-MINTY-6G6-B_W0QQitemZ270060615207QQihZ017QQcategoryZ118983QQssPageNameZWDVWQQrdZ1QQcmdZViewItemIf you decide to go with a fender though, it's best to use a fender bass also. I would'nt use anything but a fender or a rickenbacher(sp) anyway, but i dont want to pay a fortune and a half for an instrument if im going to actually play it on the road and not put it in a glass case (speaking on the rickenbacher)

Tube amps will definantly put a dent in your pocket, but its worth the extra cash to get somthing that sounds good, and then you arent regreting buying somthing later on and blah blah blah....