I keep my contacts in Outlook right now, but I have a suggestion, no matter which product/solution you use... don't use all the fields.
I find that I fill in the lastname/firstname and then put EVERYTHING else in the Notes field. This lets me easily move things between solutions. As soon as I start using fields (address, phone, etc.) then if I want to transfer it, it gets to be difficult. Moving just a notes field around between tools has proven very easy so far for me.