If you are trading an Estrella for this bike mainly because it is slightly more common and easier to get parts for, don't. I have found that it can be a pain to get parts for just like any grey market bike here. My bike spends quite a bit of time in the shop, not because it actually needs to spend quite a bit of time but because when it does need something it can be quite a hassle to get it done. You would be better off looking for something that is available in Thailand if you are looking for ease of service.
That said, it very rarely needs anything that is not cosmetic. I keep it in pretty top shape cosmetically which is why it spends so much time in the shop. Coming from an Estrella, you will also find that the GB is a very thirsty bike. I have a Versys 650 as well and the 650 driven hard uses just a little more than half the gas that the GB does. I mostly save it for special occasions, if you are putting a lot of KM on, you better plan for the extra cost of gas.
As for the metal badges, they are a nice thing to have but no guarantee that it is actually a TT edition. As far as I understand it the actual TT edition of this bike is very rare and comes with the full fairing.
I paid 40,000 for my bike four years ago and have put at least another 15,000 into it to make it look as good as it does (the black and white one in the photo above is mine).
45,000 seems right on for market price of these bikes. You will find that if you do buy this bike you would not even dream of selling it for that price. If someone offered me 80,000 for this bike I would refuse. It just has too much sentemental and personal value to me.
You can also get a recycled green book for another 30,000. I would recommend taking the bike for a ride, if you find that you fall in love with it, get it. It would be very hard to distinguish just how 'original' the bike is as they were never really a collector’s item in Japan so they have not really been that well cared for coming out of Japan. They probably get better treatment here than they did in Japan.
Hope that helps.
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