Noob 7800 questions

Hi 7800 fans,

I'd like to pick your brains about the 7800 as its a system I don't know great deal about but looks like something I could be tempted to get into.

First question.
I've noticed there are 2 different version of the console. There is this one:


I believe its called a pro system from writing on it?
Also there is this type:


Is there a difference between the two? Is one better than the other?

I'm currently looking at this one on ebay:
http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&pub=5574883395&toolid=10001&campid=5336500554&customid=&mpre=http%3A%2F%2Fwww.ebay.com.au%2Fitm%2F140995261788%3FssPageName%3DSTRK%3AMEWAX%3AIT%26_trksid%3Dp3984.m1423.l2649

Is this a good price? Any reason not to buy this one?

I know about the US versions only coming with the joystick and Euro spec ones coming with the D pad. Either way the controllers are a non issue.

I've also got my eye on the new expansion module. Should it ever be released will it be compatible with a PAL version, or will I need an NTSC version?

That should do for now. I'm sure I'll have more questions later.

Thanks in advance.