I'm using Hyflux's e-Life which gives me micro-clustered water. I believe it is the most cost-efficient water filter which produces micro-clustered water. Hyflux's filters use ultrafiltration (UF), which ensures very clean and safe water. Somemore, it is a Singapore brand, simply good and cheap!
For alkaline water, I don't have any concern over it, as I'm sure that we are getting enough alkali from our food everyday, like milk and many veggie which has a high pH. I think having an alkali water filter is a waste of money (they cost unreasonably so much) if you have the right food.