I am not seasoned, but I am in the process of seasoning... :) 80's are generally more available. If you search through this forum, you will find hints of which ones to go after first. If you are on a limited budget like myself, then you have to get the better ones before they appreciate. That being said, even some of the 80's coins are appreciating right now. As KOT said, your strategy will depend on your collection style.
Investors may buy multiples of the same date/coin because it is difficult to get. Collectors will buy single coins and move on to the next dates. For me, it is what falls in my budget. I decide the budget first and have a list of coins. Coins that fall in the budget I buy, if they do not, I don't. Occasionally, I'll stretch for that really hard to get coin and pay retail because I'm not patient enough for it to show up $30 cheaper. It is also important to notice pricing trends.. What they were the previous 1-3 months, what they are current, and where they went after some time while you are shopping. Focus on a particular size and develop your technique/strategy for hunting down the coins..
Watch out for emotional/spontaneous purchases. It's better to know your range so you don't overpay, and if you do there's a valid reason for it. 80's is generally more available. 2013-2015 > 2011-2012 | 2009 > 1985-1989 > 2010 > 1999-2008 > 1990 > 1996-1997 > 1991-1994 > 2002 > > 1998 > 1995 > 2006.. Something along those lines in my realitively new experience.
Peter Anthony's book Panda Guide is helpful and onsale from the owner of this boards website. I paid $53, the online store here has it for $37. I believe he's coming out with a new book but not sure of the release date. I would pick that one up on issuance.
http://www.pandausa.net/Gold-and-Silver-Panda-Coin-Buyers-Guide-2nd-Edition--by-Peter-Anthony_p_123.htmlI don't know your 'area' of the world but that also plays a factor of what you can get. So I'm sure that will influence pricing but makes it important to establish baseline price targets and know what going rates are.
Good luck!