Typically tactical looking knives bore me to no end, and so I am happy to give you a number of suggestions.
Here's one knife which I do think fits all your needs. The Maserin Touch Line Olive. It's only 47.95 pounds at Heinnie. I have 2 other Maserins, and I do think they are very well made. A bit of italian flair in your life, why not !
Here is a smaller (2" blade) knife that fits your needs, also from Italy. It's actually a small version of the Spyderco Volpe which Fox produced for Spyderco. The Fox mini spy:
My other suggestions are not 100% in line with all your requirements, but still interesting...
For example, continueing to explore the italian connection, do consider the affordable Viper Inox Olive. I have it, it's lovely, but it doesn't have a clip:
At the higher price limit, the Fallkniven model P (I once played with it and loved it but can't remember if it has a clip):
Affordable and good looking (but I never handled it, so it's just from observation), the Magnum Earl (without a clip):
Not one-hand, nor with a clip, but really nice (that's real abalone), well made, so very non-tactical, and incredibly cheap is the Magnum Treasure. I love mine and everyone goes "ooh" and "aah" when they fondle it :
And I can't resist to bring another affordable non-tactical, non-clip two hand favourite of mine to the table. The Eka Masur is incredible:
enjoy...