New Wii User here, questions ahoy!!

[nordlead]

Don't know, In the US 100 points = $1. I don't know if it is the same for the UK, but it looks to be so based on amazon.co.uk in the used section (which would really be people reselling unused cards) http://www.amazon.co.uk/Nintendo-Points-Card-2000-Wii/dp/B001TOQ8KC/ref=sr_1_1?ie=UTF8&s=videogames&qid=1246975716&sr=8-1

You don't NEED an SD card and I wouldn't suggest buying one until after you run out of space. You have 512MB internal memory which has been more than enough for me so far (you can check out my complete VC/WiiWare and disc based game collection in my profile) If you really need an SD card 1 or 2 GB should be more than enough and buy whatever cheap brand you can find as speed doesn't really matter.

There are only demos for DS games through the Nintendo Channel (which can be downloaded through the Shop Channel)

No, Sonic has sucked since Sonic 3, but if you insist on buying one ask RolStoppable or another Sonic supporter as I'm fairly sure he has played all of them.