Knew about Sowter, maybe one day for a hifi but way too expensive for guitar, I just saw they now have a guitar line, I'd be afraid it's too good, maybe great for a Hiwatt type.
Banzai is silly expensive for wire, though they do state it's Alpha and that's expensive even from Mouser. Alpha's prolly making it in China now. At that price it's cheaper to order Kimber from Handmade in the USA. It does help to google for PTFE rather than Teflon, thanks for that. Bulkwire.com actually ships pretty cheap in a $17 flat rate int. envelope, at least that's what playing around with their order form indicated.
Great link to Elec Novarria, wonder if they make those trannies or source them from asia? Price is low. I already knew about Bartolucci but like Sowter too pricey/fancy for guitar. Also I found this, in the UK, don't know if they do one-offs and what costs are. The high Pound hurts.
http://www.audiomarketing.net/bartolucci
http://www.transformers.uk.com/
Keep it coming, I'm glad I asked.