I'd take the $500 you are looking at spending on a new 50cc, and go buy the used Makita 6401 and an Echo CS-310 30cc.
The 30cc Echo is a great saw and very light. I processed probably 5 cords of wood with mine this year (though I just added a Dolmar 6400, because the 30cc saw is really slow in big oak).
Those two saws will cover your two jobs much better than one compromise saw, and at the same price.
Yes.
A little late for me to chime in now, but that is exactly what I'd suggest. I spent years with a single 50cc saw that served me well. I then added the little Echo brand new for $200, and then later the used Makita for $300 when my Husky 350 was about ready to retire. (I destroyed the Makita by dropping a tree on it, so replaced that with a CS-590).
In hindsight, I wish I'd spent all those years with both one big and one little saw, rather than a single mid-sized one, as there are always a million uses for the smaller, lighter saw as well as the greater ease/speed and occasional need (for me) with bigger trees to run a 20"+ bar on a more powerful saw. As I'm putting on some age, I really appreciate the lighter saw for the lighter jobs, and the time-saving of a big saw that bucks logs like cutting butter. I'd never go back to a single saw.