I say start small. You own a triple rec that I assume you like the tone of right? Well instead of tossing the triple rec here's an idea: buy the TA without buying a power amp. Plug a regular guitar cable from the output of the TA to the effect return of your triple rec. Make sure the effects loop in on and the return/mix level is at 100%. Now you can plug your guitar into the TA without buying everything at once. Doing this will give you a good idea on if the TA is right for you. If you decide the TA is the way to go then I think it would be safe to sell your Triple and get a power amp such as the 2:90 or the 2:100 (hell even the 20/20 sounds great and will be easy to carry).
There are a couple of TA's on ebay and that is where i bought my preamp from. You have to be careful as there are a few different versions (V1 without the recto board, V2 with recto board without the phat mod, V2 with recto board and phat mod, and V2 without recto board but it is labeled as searing boogie lead). Generally speaking the V2 without the phat mod is the most desired version (I own this version) and was only made for a few years. Make sure that the effects loop worksm, all of the display LEDs light up, and which version it is before you buy. My TA did not have a working effects loop but luckily i was able to repair (i don't think the normal user would have been able to).
Once you understand signal flow you will understand how these complex rack systems work (ie series, parallel, amp switchers, etc). Do some research and be sure of what you want before you buy but never get rid of something that you like for something you've never tried.
Good luck,
Greg