Vintage Lenses - "Super Slow" Set

[QuickHitRecord]

I'm exploring the idea of assembling a set of "super slow" vintage primes with an f/stop of f/3.5 or slower for use on short films, personal projects, etc. Why super slow? Because I want the benefits of shooting wide open (circular bokeh & potentially softer image) without throwing the background totally out of focus. Plus, I've been trying to shoot at a deeper depth of field lately because it is a look that I find myself gravitating towards more and more. Plus, slow lenses shouldn't cost much and might even open up the opportunity to work with some real sleepers that no one really cares about these days.

Ideally:

• Focal lengths: ~20mm, 28/35mm, 50/55/58mm, 85/105mm OR a super simple set like 24mm, 50/55mmm, 85/105mm 
• f/3.5 or slower (preferably all the same f/stop)
• Same series of lens for consistency

Preferred:

• Old and weird (single-coating, etc.)
• Adaptable to Canon EF mount
• Focuses the "right away" (focus scale to the left of infinity)
• Readily available and under $200/each

Does anyone have any recommendations?