I go back to being a youngster fan listening to Johnny Most and mid 70's team. I'll limit my list to guys I have proper memories of...Though I have a lot of love for Cousy & Russell and the early dynasty guys.
1) Larry Bird - no one will ever top him in my eyes...obviously a great player, but he also played during my teen years
2) Kevin McHale - the 80's teams will always be my favorites...a true Celtic
3) John Havlicek - I only remember the tale end of his career but he was a living legend and still a heck of a player right up until the end.
4) Kevin Garnett - he really moved up my list in the last couple of years.
5) Dennis Johnson - such a steadying force for some great teams.
6) Robert Parish - a stoic and reliable rock in the middle..And he smacked Laimbeer
7) Reggie Lewis - man, I wish we could have seen more

Paul Pierce - so nice to have him win me over. He bugged me a bit when he was younger.
9) Dave Cowens - I missed his best years, but I remember his guts.
10) Cedric Maxwell - Cornbread was a mean player
11) Tiny Archibald - sooooo good
12) Bill Walton - what a great year 86 was
13) Ray Allen = I still have love for Ray. It was really great to have him on our team.
14) Jo Jo White - Again, I missed his better years, but boy was he smooth and reliable.
15) Rajon Rondo - a unique and exciting player...move on up Rajon
16) Danny Ainge - always scrappy and clutch
17) James Posey - it was one year, but I really loved him that year.
18) Antoine Walker - he was fun to have around...he gave us a lil hope when there was none
19) Dee Brown - he tried his darndest to carry the torch
20) Gerald Henderson - a guy made the absolute most of his talent, made some huge plays, and ultimately landed us the 2nd pick in the draft (we won't speak more of that pick)
I'm sure I missed a few but that's my list