Given your givens, your price range makes a lot of sense. As a prospective knife maker, I'd like to steer you towards a semi-custom of some sort but there aren't many of those you can afford. You might find some of the Richmonds interesting in that they've got a couple which are very "niche," but their Lamson made knives aren't without issues.
ZDP-189, R2, and SG are not semi-stainless. They're all stainless alloys of a class called "powdered metallurgicals" (aka metallurgical powders aka PMs). There are some advantages and disadvantages to them.
The Konosuke makes several different knives in HD. All are lasers. I believe the Kono HDs are the only semi-stainless wa-gyuto.
There are a few really good carbon knives with decent stain-resistance within your price range; a few nice stainless knives as well, and a bunch of stainless cladded carbons. While I hate cladded knives, it may well be the way to go for you.
One of my favorite knives is a Richmond Ultimatum in 52100 carbon (the others are both Kono HD). At 7oz it's definitely a workhorse, but may be on the heavy side for you. The Ultimatum is also available in M390, which might be of interest in that it's the current darling of the PMs. If you're serious about an Ultimatum, you'll have to make up your mind really fast. They only stay in stock for a few days; it takes months for Richmond to restock; and I understand they have a batch coming in very soon.
There are too many alternative to list. It would help if you could narrow the field some by talking about what you want most; asking questions about particular concerns, or just talking some more about yourself.
Before we get too carried away... where are located?