Advice needed please

Right don't know if this is right place to post or not(if not sorry feel free to move it)

I currently have a 1999 Sv650S and i have been thinking for a while whether to buy a new bike or not. So went into Shirlwas Suzuki (Aberdeen) today price on a new SV650S is £4600 and trade in value of old bike is approx £1300.

My bike has done 30000ish miles and trying to decide what is the best thing to do financially. My current bike is in need of new tyres, major service( i think as the 30000mile mark), tax, mot and new shocks(maybe, from stuff i have heard on here they tend to go at about the 30000 mile mark). I approx these costs at £180 new tyres, £250-300 major service and approx £100-150 for tax and mot and shocks no idea on £. So what i am looking for is suggestions what would be the best thing to do? How long is my current bike got left, dont went to go shelling out lots of money only for the bike to break the next minute. Any advice would be greatly appreciated.

Thanks Aaron(sorry for long post!)