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.
IF it's a 9.8 W...
I don't know. I thought of getting my 9.8 copy signed but in the end decided 1 it wasn't worth the risk. 2 Even though I have a lot of SS books, I kind of like having my bigger books in the pure form.
Also I've noticed on this book while sometimes on on ASM129 sigs will go for more. Other times they go for less in the same grade if you follow the sales for a while
Clearly lots of differing opinions on the subject so I'd say go with what you think you'd like to see everyday. I understand people who don't want the art interrupted by a signature but I also like Sig Series issues, unless the signature obscures a key part of the cover. I always wanted a copy & finally got my ASM 129 a couple years ago largely because it was a double signature with both Stan Lee & Gerry Conway. Since this was one of the many key issues from Romita then I think it be cool with his signature. Good luck with your decision.
Here's my copy: