I spent a lot of time looking for and researching a new machinists vise about 5 years ago. I wanted a good quality US made vise that would last my lifetime and then my son could use it for a long time after I'm gone. Like you, everything I looked at used was either overpriced or really beat up. So I decided to bite the bullet and buy new. I'm not sure what a reasonable price is for you, but the best value I found were the Yost machinist vises. I ended up buying a Yost 6 inch machinist vise with a stationary base. It's quite a hefty vise with a jaw opening that is almost twice the jaw width, like the old vises. It's been the cornerstone of my metalworking shop for about 5 years and I've been very happy with it.
Prices on the Yost vises have gone up since then, but I think they will still be tough to beat.
www.useenco.com has the 5 inch stationary base machinist vise for $390.95 and they are offering free shipping right now. That's about what I paid for my 6 inch vise back then and I also got the free shipping, which from Enco cost $90 back then. Maybe someone else is offering better prices now. But, if you're buying new, they are very nice vises for the money. Also, from time to time, new blemished Yost vises show up on eBay with significant discounts.
www.yostvises.com/index.htm