Hi
It's a question of affordability at the end of the day - as long as you can afford your payments each month you should be happy.
The mortgage rates are ever changing & i think over the next few months we should see some more competative rates appear.
As usual i would recommend seeing a fees free mortgage broker they will be able to advise you of the best deals out there & help you decide on a 3 or 5 year fix - just remember that mortgage rates go up as well as down - just see how many unhappy people are coming off 2/3 year fixes & are struggling to remortgage & deal with much higher rates.
Good luck
Burger