Howdy! I will tell you in a moment what pens I, personally, would use; but it would be more useful to know what kinds of pens you enjoy. For example, I don't have particularly large hands, so I tend toward smaller pens; and I'm a writer by profession, and I sometimes use my pens for long writing sessions, so I also tend toward lighter pens because the heavy ones are fatiguing. Other people might need larger pens, or find a heavier pen more comfortable, or need a discreet-looking pen for the workplace as opposed to something eye-catching and blingy. Maybe then folks will have some good suggestions for you?
For myself, personally:
1. Signing documents: I usually use a Nakaya Naka-ai for this, mainly because it's the one pen I keep loaded with Platinum Blue-Black, which is an iron gall ink and which I feel is reasonably good for business purposes--not an exotic color, and something that's pretty water-resistant and so on. Of course, I'm a science fiction writer so I doubt my editors would bat an eyelash if I signed my contracts in green, but I generally don't.
2. Everyday workhorse: I've used all sorts of pens for this! In the past I've used a Webster Four-Star, which is vintage pen that happens to have the smoothest, dreamiest XF nib I've ever experienced on a pen that fine-nibbed. These days, I use one of my two Aurora Optimas, because they are so well-balanced and comfortable for my hand size, and they just work. As piston fillers, they have pretty good capacity, and the nib units screw out, which makes them easy to clean when necessary (as I had to do recently). The nibs are slightly toothy, in a pleasant way, and I have never have any issue with writing angle or so on. I have a blue one with chrome trim and a 75th Anniversary (red), and I ink them up with blue and red inks respectively, which is useful when I'm color-coding things in my bullet journal or marking up drafts.
3. For everyday carry I will usually use either the blue Aurora or, sometimes, a Pilot Vanishing Point Twilight. The Twilight is a great pen because of the click-mechanism--I find it especially useful for taking fast notes when I don't want to have to fuss with unscrewing and rescrewing a cap--and it writes pretty reliably.
But there are many great pens out there for all sorts of tastes; these might not be to your taste at all. I hope you find pens to your liking!