It's is a path I've been down: I had a LMIII, wanted a tubier sound, so tried a Sansamp BDDI in front of it, liked it, and wanted that tubier sound in one box, so I tried a lot of the smaller hybrid heads (including the LMTube and Rocker, neither of which I liked much - one ineffectual as MM20 says, the other too fizzy) then bought (in order) a TC RH450, an Ashdown Spyder, a Mesa M-Pulse, an SVT Pro-7, a PF500, a Walkabout and then a Streamliner. I've stuck on the Streamliner because it works for me, but I guess if I had to pick a second place it'd be the M-Pulse, tho that's a full-size head. Never tried a TTE, but I'd like to.
Rather than bung the board up with stuff I've typed before, if you want any more detailed opinions, just PM me.