Zoom.pro and Finder.pro would be good for a search engine perhaps.
Spider.pro is also good for a related use (SEO/web crawler ?).
It's hard to value .pro names but I would say mid-$$$ for each
Pixel.pro sounds good for a design/webdesign agency.
The others are average IMO.
Since the .pro registration fee is quite expensive ($99/y) I think you should actively use your names and not wait for a sale. I am using mine and not expecting to sell them... In a few years maybe, or when the rules on .pro ownership are relaxed.
I like .pro too but you need to make them work for you and recoup the costs.