I am looking to get a new scanner my Pro 90 appears to be a little antiquated for monitoring the Clark County, PDX system. I haven't kept the pace with new scanners can anybody make some recommendations with regards to new handheld units to look at.
Digital isn't terribly prevalent in the area (yet). That being said, there are several P25 systems being built up, that will be operational before the end of the year. The Bearcat 396XT (or a similar GRE/Radio Shack unit - the PSR500/Pro-106) are good options. They will come in at or near your limit of $500, but you could/should be able to find deals around town/the web.
If you want to forego digital for the time being, the analog equivalents (the Bearcat 346XT and the GRE/Radio Shack PSR300/Pro-164) will work just as well (for less dollars), but obviously, no digital capability.
joe