[jp1216]

I've been sitting on a '59 Topps set for nearly 20 years and I'm considering parting with it. Only 28-30 are graded (old SGC labels). Grades are all 6-8.5. Variation cards (no option statements etc) a little lower. Raw cards range from 4s to 9s. High numbers being lower grades.
The Mantle is a solid 7. Gibson is a 8.

What would be the best way to part with it? Should I invest $1000 (or more) and send the best 100+ to PSA? Crossover the SGCs? I'm not looking for a quick sale and really haven't decided to part with it entirely. Thoughts?