General questions about X60/x61 models, plz help.

Hi everyone. I've been a T42p user for about 2 years now. And now i've decided to upgrade to an X model. However, i don't know absolutely anything about X models. I've been looking at different configurations and got totally confused. Please help me figure this out.

So, if i understand correctly, X60 Tablet and X61 Tablet both can be used for taking notes with the digital pen (stylus, or whatever it is called, i am not quite sure) ?
If so, what is the difference between the following display configurations offered:
12.1" XGA MV-MultiTouch TFT LCD (1024x768 resolution) and
12.1" WVA SXGA+ TFT LCD (1400 x 1050 resolution) ?
Does that mean that the MV-MultiTouch is the one where you can write on the screen with the digital pen and the other just have higher resolution ? ( Or can i write on the higher resolution display as well ?)
That is the part that i am mostly confused about.

Other thing that i am confused about is the 2x3 UltraConnect II Antenna. What exactly does it do ? I was under the impression that it had something to do with the wireless n-draft. But then i saw X models which had 3945 a/b/g (And NO "N") adapters in them along with that antenna. So, was i wrong to assume that antenna is going to be used for MIMO (Multiple Input Multiple Output) technology of the N-standard, for which a higher bandwith (and therefore an additional antenna) is needed ?

Last thing (for now) that i want to know is this: Is it possible to replace an HDD that current X models have in them with an SSD (once they get a little less expensive that is)? From my understanding SSDs will have the same interfaces as present HDDs. The reason why i am asking, is because i saw all those Sony Vaios some of which already have an SSD instead of an HDD. So, i was hoping that X tablets had a potential for an upgraded in a near future.

Appriciate all the feedback i can get. Thx.