You need to be careful. Many people are leery of signed copies and there's no guarantee it will sell at the price you want. As it is, ASM #129 isn't the best long-term Bronze investment as prices are dropping. First and foremost it is IH #181 and then GS-X #1. Prices hold on these two gems, so perhaps sell your copy and upgrade to one of these?
Do not SS it. A lot of people like me will not buy SS books, shrinking the buying pool. There is no shortage of SS books out there, so your book would not be any more special than it is.
The Punisher has long-lasting appeal, especially if the upcoming series can draw even more interest in the character. Keep it.