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I use the elecom EX-G trackball[1] for this reason. The default button mapping is middle-click on the scroll-wheel but it has 3 full-sized buttons on top as well and remapping is easy. There's nothing worse than middle-clicking to paste and having the scroll wheel scroll the screen slightly.

1: http://xahlee.info/kbd/elecom_trackball_ex-g.html

I prefer to just use a normal mice (In fact mine is not that normal because it is vertical). I'm on macOS and why bother to shop an old school one for rare usage? That's why I prefer the context menu too.

IBM scrollpoint nice have a real middle button without giving up a scroller.