As I spend a lot of time entering series of numbers into ERP software, Excel tables etc. I am very happy with numeric keypads and would never buy a keyboard without one - well, the Type Cover on my tablet doesn't have one, but I have a Logitech wireless keyboard, with num pad, at the office for it.
I also have a Razer Black Widow keyboard with Cherry mechanical keys, that cost about a hundred quid in a sale last year. Excellent keyboard and well worth the money.