Want to update 20 year old LP12/Grace-what arm?

Just got a used LP12 which is allout of allignment but think works ok electronically.Ectremephon told me to just see if I could do adjustments myself but thinking about turning it into a project.He warned me that a basic "tune up" is a waste of money at aound $200 but thinking maybe the cirkus thing for $400 might be worth it.Thoughts?Also I was thinking of replacinfg the old Grace with a RB300.But I have a freind who will give me his AQ PT6 for almost nada.Oppinions ladies/gentleman?