If you want to record, i think you should try the Bogner cab with 2 V30 and 2 GT75 (I think it's that model...) it give you more possibilities with the 2 kinds of speakers for your records...
but if you want to play alive too, i think you should buy a recto cab...it's indestructible, unbeatable and it's the perfect partner of your 5150
Really thinking about getting a dual rec with EL34's and a uberkab now, actually that was the thread name lol, just now realized that i already though about that combo.
Even if i keep my 5150 it would still be nice to pick up a used dual recto and maybe a second hand cheap recto cab. I think stepping away from a 212 might help a lot.