I've been using PL's for some years. I've found that so much of what I expect of my (integrated) amp depends on its tone, which in turn depends on tube selection. For example, if I want a full, warm tone, I'd use Tung Sol 6550's, and for a cooler tone, i.e. greater clarity etc, I use SED 6L6GC's. So if all you want to do is spend more money on your system maybe just some judicious tube rolling will keep you busy for a few years :-).
But, FWIW, were I dedicated to going back into separates I think I would bite the bullet (cost wise) and go elsewhere.
But, FWIW, were I dedicated to going back into separates I think I would bite the bullet (cost wise) and go elsewhere.