Both a factory center stand and a set of stands are good options, the front & rear stands will get the bike up higher and hold it completely stable for jobs like removing wheels and servicing brakes. The bike already has the threaded holes and attachment points for the center stand, just pick one up off Ebay or even new from Suzuki, they aren't terribly expensive. I've had my pit bull stands for about 12 years now and they're great, I have front pins for four different bikes at the moment and I still need to pick one up for the DL.
As for the tires question, for me it's a matter of cheap insurance. Sorta like your helmet. Plenty of people find many helmet brands to be horrendously expensive. For me it's not a question of the cost of the helmet, rather your skull. What's your head worth to you? My head isn't always as useful as I'd like it to be, but the warranty is expired so I can't replace it anymore, so I try to take care of it. Tires, for me, are of the same philosophy. They are the last word in your having a good day and a bad day when it comes to being on or in any kind of motor vehicle. I bought my 98 VFR five years ago with tires on it that looked great but were 8 years old. I insisted on replacements. It just isn't worth the risk, a tire is a dynamic machine, there are a lot of factors you can't see and you also can't test, especially with modern tires. For me coughing up the money for new tires is cheap insurance, Murphy is always watching.