I love these watches and have a small collection of them and I still I look at them everyday on eBay to see where the market is heading. They look great, are rugged, and gaining in popularity among collectors... prices are on the rise, as are prices for almost every type of vintage stainless steel diver and chronograph.
Pogues are very plentiful, so if you are patient, I think you can find a very nice serviced one with a great yellow dial, bright bezel, and the correct H-link bracelet for under $800. Even less for a blue dial. I've found that generally, Seiko's water proofing gaskets seem to hold up well, so you should be able to find one with a nice, unblemished dial. If you're willing to live with a little wear and tear on the case and bezel, and a faded dial, you can probably find one for under $500 pretty easily. Again, if you are patient, you can find one that you like within those prices ranges. I haven't paid to have one of these chronos serviced so I don't know what to tell you to expect if you buy one needing to be serviced.
The Rally divers don't seem to turn up as often as the Pogues, at least judging by the listings on eBay. A couple of clean, but unserviced ones, with black dials, nice black checkered bezels, and the correct bracelets sold recently for just under $700. The bracelets are hard to find and seem to have been used on fewer models than the H-link bracelet used on the Pogues, so that is something to consider if you buy without a bracelet hoping to find the bracelet later. Also, there have been some nice reproduction bezels made for these, so if that is important to you, be sure to ask the seller. I've serviced a few of these and there are no unusual complications that make it expensive to service.
Compared to other higher-end vintage divers and chronos, I think these models are very undervalued.
