"...and now for some Japanese..."
From this point on, I personally don't consider these bikes to be "vintage" (triple discs, electronic ignition, DOHC, etc), but they are older than 25 years, so...
1980 Kawasaki KZ1000 A4, unrestored, MAC header pictured, but now with Vance & Hines system (jetted to match). Tracy 2001 quarter fairing, slightly cut down seat, superbike handlebars; otherwise bone stock down to the original airbox. I bought this bike in 1985 with 3 miles on it; the local all-brands shop had it stored way in the back, basically forgotten in the days before computerized inventories. I get unsolicited e-mail offers to buy it, sight unseen, on a regular basis. I really hate the 80MPH speedo. This is the bike I've put more miles on than any other in my collection, with the exception on my 2000 Triumph Legend, and 2003 ZRX.
1983 Honda VF750F Interceptor V45, unrestored, D&D headers, factory cam swap, braided stainless brake hoses, otherwise stock. I've had this bike to 130MPH indicated, with a bit left on tap; handles fantastic at speed.