Changing School for Sixth Form? HELP!

I'm currently in year 11 at a fairly mediocre school. I'm predicted to get pretty high grades (As and A*s) and I've got conditional offers at all 4 sixth forms I applied to:
1. A very good grammar school, super high standards, but 1.5 hours journey realistically
2. A good state school, very large intake, about 40 mins-1 hour journey.
3. A decent state school, probably better than my current one, 20-30 mind by bike/bus.
4. My current school, ok sixth form, 20 minute bus/cycle.

I have no idea what to do. I like my current school, and the teachers I would have are good. I know I can do most of it myself, because that's what I've done for the last 5 years to get myself to where I am. However, I feel like a change could be beneficial. Some of my friends are moving, some staying. I don't know anyone at the others.

With only two weeks left, It feels very strange that I might not come back to this school, as I've grown quite attached to it,(I get on really well with the teachers, atmosphere, choir etc.) but I'm not sure if its really good enough to stay for, (the sixth form could end up being really different) especially regarding support for uni applications etc, (medical societies are non- existent and they send about 1 person every two years to med school)

All the people in the year above me who moved seem happy, but those who stayed don't have any serious complaints.

Is it worth the stress of new teachers and people and buildings? Is a change good? Did you miss your old school?

Thanks!
(Sorry for the essay!)
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It's probably best to trust your gut feeling with this. There are so many different factors and they have a different importance to every individual person, so nobody can tell you which one to take. For me personally, anything more than a 30 minute commute would drive me crazy so I'd go for options 3 or 4, especially since your own intelligence is much more important than the reputation of the school. However, I'm sure there are plenty of people here who would disagree with that. As you've mentioned, if things like Medical Societies are important to you, your current school is clearly not the best option.

I personally can't judge if change is good since I stayed at my secondary school, but all of the new external students in my sixth form are totally settles in (possibly more so than the internals, most of the school council is made of external students!).