Loads of good ones out there, Start of with Curtis's first band THE IMPRESSIONS heres a good one
caution theres a vol 2. You cant go wrong with the ACE label
but heres a real cheap one £3.87 at Amazon) which you cant go wrong with.
As for Curtis's solo stuff, i'd suggest you get a good compilation first and if you like what you hear start checking his solo stuff, such as ROOTS, but you may find that you have enough
heres a good cheapie also from Amazon £8.37.