Let's talk about holidays

In the last five(-odd) years I never really made it out of the country - apart from the occasional trip to Scotland or to see my family in Germany - and I really (I mean REALLY) need a holiday.
I am currently raiding the internet, looking for affordable deals, preferably all-inclusive, somewhere where it's warm and not too humid.
We're planning to go on a holiday at the end of September, for about 10 days.
Do you guys have any recommendations? I am not particularly interested in specific hotels, rather in countries. We were looking at Malta, but it's quite pricy, same goes for Greece. I am not a big fan of "lively resorts", i.e. lots of party and children, like Benidorm or "Schinkenstrasse".
Budget-wise.. not sure, let's say a maximum of £400-500 per person incl. flight and transfer. The cheaper the better.
So if you have any ideas and don't mind sharing them, I am waiting

Cheers!
Keswick