Thanks for the advice! I really appreciate your patience with my questions as this forum doesn't seem to be very beginner-friendly (e.g., https://www.head-case.org/forums/topic/11746-stax-srm-006t-plus-kimik-or-new-srm-323s/).
As you mentioned, the T1 is very old, and I'd rather not have to mess with recapping and such. I did find a used SRM-006T for €675, which sounds tempting, but after reading about the dangers of electrocution while rebiasing tube amps, etc. I think I better stick with solid state ':D
I'll probably go for a ~ €450 bid on a used SRM-323S auction that ends today. Other than that, the cheapest SRM-353X I've found is an €800 demo model that would seriously stretch my budget.
EDIT: I just realized my posts in this thread have been very off-topic. To link them back to the thread: I'd love to get the T-8000, but I find it totally unaffordable, and probably overkill for the SR-L700 anyway.