Hi Caesar,
It is indeed a benign load to drive with single order crossovers and a fairly high sensitivity. And yes tubes, especially SE, do give you that "breath of life infusion" in the midrange, increased clarity of midrange tone and often a richer tonal colour palette. However good solid state has it perks too, increased low bass definition, control and slam, blacker backgrounds, overall lower "noise levels" and just more power. I find this to be especially noticeable on large scale orchestral pieces of which I'm personally a big fan. I also like movie soundtracks which can often be considered as large scale orchestral. Although you still do not need a lot of RMS/continuous power there are short term jumps, often just a few microseconds, where power requirements can easily jump to 200 watts or even more to accurately track the complexity and swell of the orchestra. This translates in keeping a better overview when things get complex/busy, you can track all individual instruments and both micro and macro dynamics are better rendered. I've used high power tube amps in the past like the Manley 440/500s and VTL 750s who pull that off too, but you do lose some of that special SE midrange magic with those and solid state has become a lot better. CAT amps pull that off too and I'm sure VAC does too and there are several other high power tube options. With all that said I do have a loaner Alieno "hybrid" amplifier here, it's not hybrid as in a tube stage followed by a solid state stage, but it applies a technology (I don't know how it works exactly) which was described to me as a 300B OTL providing the voltage gain and solid state providing the current gain. Maybe the 300Bs drive the base of the transistors, but I'm just guessing here, I really don't know and I'm not going to open it up to retrace the circuit design. At any rate it's a 300B OTL with 250 watts of output power. It does do large scale orchestra really well, keeps the full overview, never "falls apart" nor fails to "climax" all the way to the peak of the performance. And it does have that special SE quality in the midrange at the same time. It only falls short of what my Audionet Stern/Heisenbergs can do on ultimate sound stage size / immersion / envelopment and it does not have the absolute silent and black backgrounds, does not dig as deep and does not exert the same iron fisted control over deep bass, BUT completely compensates for that by that "reach out and touch" midrange quality. I could happily live with these and never look back.
So to sum up, if you're asking me, by all means get those tubes if you're all about jazz, blues, smaller scale classical and midrange purity/clarity and tone is all that matters to you, yes 6 or 8 watts is plenty for these purposes in a RTC 0.6-1.0 room, for RTC 0.4-0.5 I would sooner opt for 20-60 watts. But if large scale orchestra is your thing, you are going to miss out on some of what makes it large.
All IMHO