Jake - you may feel that you love your current club. But in 5 years time, you will regret not giving it a go, if you pass it up mate!
Opportunities like that are few and far between. So when you get one, take it and run with it!! If it doesn't work out or if you don't enjoy it, then you can always go back to your old club.
You will always have the opportunity to play at the same level you are now, and there are likely to be loads of clubs at that level. But being invited to try at a higher level whilst you're young enough to play at that level is a one-time chance mate! Go for it. If you don't then I will have to give you a clip round the ear and send you to bed without any tea! May even ground you for a Month!!