Recommend Modules etc. for HP 41C

[Trond]

Hi everyone!
I am still waiting for my HP 41CV to arrive by mail, and I am sniffing around for interesting modules to use. Consider me a complete newbie to 41C here (I have 42S though, which I hear is the successor). I am not even sure how many modules can be connected at one time (I used to think 2, but now I wonder if I can use 4?), and if this ever causes any problems.

I would like to use the calculator for statistics and equations, and for playing around with (feel free to recommend games too!).

I like the sound of the Stat Pac (or maybe the Math/Stat Pac? Which is better?) and the Advantage Module. Maybe a card reader would be fun? Any more info would be greatly appreciated!