@curiousjim, LOL! Yeah I bought my REF 6 (not SE) with a full set of replacement tubes.
@sleeeepguy thanks for your input, especially since you and I have similar systems. The combo of the 250.8 and the Sabrina X's and the ARC REF 6 has been great for me. I guess ultimately, I just have to put it in the system and see what my ears think!
@speedthrills, thanks for your input too! Although the XP10 is way down the food chain from the XP32 and is probably not a fair comparison. However, based on my own experience, I can tell you that the jump up to the REF 6 from the LS28SE was a big one for me. As usual, as you climb the latter, you typically get more of everything. So if I ultimately go for the XP32, you should get my REF 6 with the spare tube set and sell your LS28SE! :)