A bit of a quandry then?
Have you looked in the Amps section? I own a TSL122, and think its a brilliant and incredibly versatile amp.
Many people, especially on various forums, tend to knock the JCM2000 series, and especially the TSL's for various reasons. Mainly the "reliability" issue is the main one, plus they say a lot of tech's won't work on them as they are too complicated etc etc., and that the Channels 2 & 3 employ "diode clipping" to create the distortion/OD.
I think that this is a lot of here say and BS.
I have read elsewhere that the TSL has a true valve signal path, and the Amp Tech at my local music shop was happy to have a look at it when I was having a problem with the DI (Speaker Emulated) output, which turned out to be me using standard a mic XLR to Jack lead, as opposed to using the wiring diagram in the manual.
The footswitch lead could be a bit more robust I guess, but you just have to careful with it. The footswitch itself is a right hefty beast!
Sound wise, with it having 2x12"s it certainly pushes a bit of air, and even on lower volume levels its bloody loud when on the full power setting. With the Virtual Power Reduction on, its still a loud amp (at home I use it on about 2-3 clean, and about 1 on the OD1&2 channels, or else my wife complains bitterly!). But I digress, sound wise, the clean channel runs the whole spectrum of lovely clean-ness to just breaking, where OD1 does the Just breaking up to full on Hi Gain, OD2 does basically the same, but with a bit more oomph (great for leads etc). With each channel having a separate EQ section (and signal path apparently) you can set all EQ's differently for "that sound", but playing with EQ's is a long drawn out process, as you need to search for the sweet spot. This is not a plug and play sweet tone amp.
Horses for courses I guess. Try 'em both back to back, and buy the one that grabs you. I tried a 5150 against the Marshall, and I bought the Marshall.
Sounds great IMO with a Love Rock / GLP, but I would say that. :wink: