Can I use the 0805 caps or are there a reason that the little "Can" like capacitors are used?
I use ceramic 0805s for 0.1µF, 1µF, and even 10µF. Usually the "can" types are electrolytic, 10µF or larger. That seems odd to have a 0.1µF cap in a can.
I also notice that the 0.1uf had a crazy amount of tolerance... -20%, +80% (My feeling is that I should look for another option,right?)
Given the usual role of a 0.1µF cap as a bypass capacitor, there's nothing wrong with that tolerance. I buy these
by the hundred. I usually look for the X5R or X7R temperature coefficient
. I'd say that one with the Y5V coefficient isn't desirable.