Any Weapon/Focus/Shield that's not max or any upgrade items that are on the low end of the scale (+21 Fort, +4 Def, 3% Furious) are best sold to uber newbers in Ascalon (for a reasonable price of course!) or just sold to the merchant.
The types of people that cuise for weapons around here are dealing in heavier duty items than those most times.
-The fire artifact can go to a merchant. Artifacts are hard to sell unless they're REALLY good, because the collector ones tend to be very nice anyway.
-The tall shield you might be able to get ~500 for, but it might take awhile to find a buyer. For your other question, the going rate on similar 16 armor shields is about 1.5k.
-The bow grip, hammer haft, and sword hilt in the middle block are probably never going to sell. Vendor these.
-Vendor the hammer mastery one.
-Icy bowstring is worth 500-750g.
-Bow grip of defense is probably worth 300-500g if you can find a buyer who wants it.