If you filter BladeHQ for >5" <$100, then order them from highest price to lowest, then look at 100 knives per page, then click the knives that list length from 5"-5.25" to open in new tabs, then close out knives that are not flat ground, you get the list below. They are all priced $76-100. These are only from the first page of 100 knives.
Kizlyar Supreme Pioneer
Ontario OKC Ranger TFI
Kizer GTI Bush Knife
Morakniv Classic Utility Kitchen Knife
Condor Garuda
Real Steel Arbiter
Real Steel Gardarik
If you filter BladeHQ for >5" $100-250, then order them from lowest price to highest, then look at 100 knives per page, then click the knives that list length from 5"-5.25" to open in new tabs, then close out knives that are not flat ground, you get the list below. They are all priced $100-134.95. These are only from the first page of 100 knives.
ESEE-5
Stedemon Uncle One
Ontario Blackbird SK-5
Spyderco Perrin Street Bowie
Kizlyar Supreme Savage
Ka-Bar Becker Kephart
Maserin MPCK
Tops Knives SXS Skullcrusher's Extreme Sidekick
Of those listed, I'd pick the Ontario Blackbird SK-5 based solely on the way it looks, the materials, the brand, and the price. I have no need for a 5" knife, so I'm not going to buy it. The SXS Skullcrusher's Extreme Sidekick has the coolest name.
Using BladeHQ and KnifeCenter for their search engines is very helpful.