I'd recommend trying Cherry MX Red or possibly Cherry MX Speed for ultra-light touch.
But I have to concentrate more for everyday use (everything other than gaming) with the Cherry MX Speed switches, my amount of type-o's has significantly increased with the Cherry MX Speed - so Cherry MX Red are probably a better choice, if you don't need the tactile "bump" on the MX Brown switches, since Cherry MX Red and Cherry MX Speed doesn't have that tactile feedback.
EDIT: (updated with link)
I should add, you can buy very cheap "
test kits" with a selection of Cherry MX switches, so you can compare the feeling of each type, and help choose the right ones for your personal taste
They come with a selection of different MX switches, and you can then spend some time pressing the different ones, trying to zero in on the best Cherry MX-option for your personal preferences (you don't actually use them with a keyboard).
It's a good way to try several switches, instead of having to buy a keyboard based on description only, if you are not able to try different keyboards before a final purchase. It could save you some money in the long run. People have very different personal preferences when it comes to mechanical keyboards