I think it's all just a matter of what you like and want to do. I've seen rooms with mixed finishes and it looks just as nice as rooms with only one kind of finish. I chose to mix finishes but decided to stay in the same color family, so in our remodel we have chrome & brushed nickel fixtures with aged nickel hardware.

Thanks, y'all. Yes, we do drink out of the bathroom faucet when brushing teeth, etc. so I guess I should go with "lead-free". My original concern was that lead-free choices seemed limited and all had low-flow (vs. just "low-lead" choices or regular ones.) I did find a good deal on a nice-looking widespread faucet that is lead-free. I was originally concerned that the low-flow would be an issue, or that "lead-free" meant "plastic parts that would break" but the manufacturer's rep assured me that I could just swap out the aerator if I didn't like the low flow and that it was still made of brass parts, but that they just changed the formulation of the brass to reduce the lead to meet the "lead-free" limitations. I guess my state (Maryland) has just enacted stricter lead requirements anyway. Not sure if they could have sold me a regular one or not, but I have noticed some faucets listed as "not for shipment to CA or VT". Anyway--here is a link if anyone else is interested. I did google for reviews of this company and they have very good reviews, btw. Hope this helps someone else!! Here is a link that might be useful: inexpensive lead-free widespread faucet

The faucet boring are all the same size, however, I would ask at the top vendor, faucet direct or do a search for ceramic or for the availability of color matched caps. Yes there are single handle faucets available for your top.

"until I can get back to it with some more experienced eyes guiding me" You did the right thing by stopping before you messed it up so that noone can fix it.