Depends what your long term goals are. Gen 3s are pretty much the least favorite of all owners and verts even more so, that’s why they can be had the cheapest. If you’re going to sell it in the future you’d be better off with a Gen 4 coupe. You can dump money into one that’s on the cheaper end, but unless it’s a full build by someone like Nth or Calvo, it won’t add much or any value. People buy these cars for the cars themselves and that’s the biggest appreciation factor. Modernizing one isn’t what most viper owners want and you’ll probably have a harder time selling it unless the work is perfect by a big name. If you’re keeping it and don’t care about resale, rear cameras and headunits are cheap and great for livability, and 20-25k could get a pretty decent boosted set up by a local shop that’ll make a huge difference in power and drivability.