I reckon 1 inch would look good but that's just me
I have a lot of scar tissue too (from stretching badly in the beginning, bad advice from a piercer and not knowing exactly what I was doing at that point).
I'm up to 4g in my left ear and 6g in my right ear. My right ear I'm letting stay that size for a few more months, since it tore in my sleep when I last tried to upsize it to 4g. My left ear is doing fine though, I just need to wait about 2 months between stretching instead of 1 month (the average for most people).
As long as you take it slow and keep your lobes healthy with oil massages, there's no reason why you can't go big, even with scar tissue.
~Strick