AA- reraise to isolate an all in?

[KHALI]

Playing the 1/2 NL at the Imperial Palace. Have built to around 175 in 30 minutes without anything spectacular really. One guy who had aorund 400 in front was open raising to $22 with any ace or any two face cards and getting called by the likes of KJoff. Beautiful.

I am UTG+1 and find Ah Ac. I raise to $8 which is my standard opener and hoped big stack would play back at me.(At a table like this would you open bigger knowing there is a high likelyhood of being called by far inferior hands?)

Two players call and an older guy who has been calling all these raises(see above) goes all in for a total of $25. Action is back to me. Do you call the all in knowing that at least one of the original callers will callalong with you or do you reraise here and be happy with what is in pot? Maybe a silly question but I don't play much NL ring games.