I´ve been looking for a Canon Compact with a fast lens (f2.0 will be great, f2.8 is also nice) and the option to hack the battery to put a bigger one.
I'd suggest going through the list of supported cameras on the wiki home page
http://chdk.wikia.com/wiki/CHDK and looking at the specs of the ones that interest you.
That looks like a lot, but you can narrow it down quite quickly because the families of models tend to have pretty similar specs. Many of the supported cameras are also old and long out of production, though you may still find them on amazon or ebay.
If you are looking for something relatively high end with good IQ and low light performance, the G1X might be a good choice. It's not a super fast lens (f2.8 ), the big sensor should help compensate.
You can also look at some thing like
http://www.dpreview.com/products/canon/cameras to get an idea of what the recent models are. Note however that the very latest models usually aren't supported by CHDK, because porting takes time.
I want to know that are the best models supported by CHDK.
In general CHDK supports the same features (hardware permitting) across supported cameras.
Sometimes individual ports have quirks or bugs, so after you find a model that looks like it might fit your needs, you should check the wiki page for that model. The wiki page will also usually link to the development thread in the forum, which is where any issues would most likely be reported.
Also I will be glad of hearing your advice on the durability of a Compact Canon Camera shutter life.
The shutters are usually very simple leaf shutters, only closed during readout so lifetime should be very good. Anecdotaly, I know some users here have put many tens to hundreds of thousands of shots on these cameras, and shutter failure does not seem to be a common complaint.
