All the 'retirement funds' in switzerland that give you tax breaks (Pillar 3a they are called) have very limited funds options from government regulation - each bank normally has their 4 choices allong the lines of conservative-dynamic with a more stock:bond ratio in each...they are all pretty dismal performers compared to the open market.

So what you want is a normal investment account and 2-300/month is definitely low in most bank eyes. Credit Suisse has a huge stable of funds, including all the ones from the non-in house firms (and everything available in English), but stock funds have a 2% buying commision with a minimum of 50Fr, so at 300Fr a pop it is distressing and if you like to switch funds every month you would by Mr. credit Suisse a nice little chalet...

Kantonal Bank has funds more directed to 'real' people in that you can invest 100+fr at a regular rate and not be hit so badly. But everything is in german.

Post finance might really be the option because they seem to have info in English on their website, but I have no experience with them...

Andrew