I've never owned a Seagull, just tried out a few in the shops. They seemed like very good value in terms of quality for the money. I suspect that shipping costs and import taxes have inflated the cost of a new instrument well beyong what we pay here in Canada, but a used instrument should be priced more reasonably.

It all boils down to whether this is a guitar you want to own, at a price you are willing to pay. If so, then buy it and enjoy! I assure you, there will be many guitars that come and go as you go through life. Don't worry about trying to find one that will last you for a lifetime. If it suits you now, it's appropriate. If your needs change, or you decide you want something different later, deal with that then.