Funnily you say the as the 6 has been a good amount for myself as well as the wife as an introduction item with low cost risk.Yeah I was going to recommend that too, but I really feel that 8-15 is the sweet spot for most people once they start using a macropad...six just doesnt cut it imo.
I'll probably next month get the bigger version for myself as i want more buttons now that I use it alot.