!2 cents warning! (and I dont know your skill level here, so Ill just post this as forward as possible, not trying to insult your intelligence or knowledge base, just some cursory information)
If you're looking for a fresh, clean cut line, more teeth the better is typically the go-to. That said, more teeth can be more chance of burning/marking. I find burn marks on end grain to be a much bigger pain in the butt to deal with than sanding some stray frays off.
I'd say it totally depends on what you're going to do after here. Is this a one cut and done kinda thing (I rarely use my circular saw for anything EXCEPT this kind of task, and its not super common), or are you trying to do other tasks like breaking down plywood later on? If you plan on using it for other tasks, then for one cut, 1 3/4" is PLENTY of meat to sand back and the blade type really wont matter too terribly much in the grand scheme of things. As long as the blade is sharp, and youre cutting straight, you really shouldnt be blowing out chunks of wood from tearout. Thicker, higher tooth count blades can bog down and take a lot more effort and focus than a low tooth blade; some circular saws just lack the oomph to really get it cutting well (burning can happen if youre not moving the blade). Thinner kerfs cut easier, but do have a tendency to "wander", and on a circular saw, this can actually be quite a pain even with a straight edge guide. The absolute truth is, as long as its not a dull, rusty, warped blade, pretty much anything is going to "work" fine here for this one cut.
So that said, id recommend if youre doing a one and done, stick between 30 and 40 teeth ("combination blade") , if you're planning on plywood duty, go higher on the teeth (a "finishing blade", diablo makes a 64t count 8" blade thatd be wonderful on plywood, and should provide a really smooth cut on that butcher block). If its going on 2x4 duty then go to the lower end of the 30 (a combination or framing blade here).
I generally stick to diablo for circular saw blades, simply for half decent quality carbide blade that wont make you cry when you buy it; but in general any "decent brand" is going to serve the purpose just fine. Dont really "need" a forrest blade, but if you got the scratch, go for it.