Ok, so i personally would spend a little more (not much more) and go with this kit
http://www.i4detailing.co.uk/acatalog/Kestrel_DAS-6_Megs_Kit_2_1.html
This Megs combo is very highly rated, and can give superb results.
It's just a polishing kit, so you will end up spending a bit more on cloths, and wax - but you may already have these?
It can get an expensive game so be warned ;)
You may want to consider getting some spare pads too, as you can get varying rates of cut with the polish buy using a softer pad, but once you've used the softer pad for cutting you shouldn't use it for polishing.
Hope that makes sense...
Also, just a couple more questions to get you thinking of more stuff to buy :) lol
Are you using a 2x bucket method of washing?
Do you have clay?
Do you have a wax or sealant
Edit: I'd like to add, that the first kit you linked to will more than likely be fine for your needs. It all depends on what level of finish you want to achieve (and maintain). :)