Remember every Army has specific lists for specific jobs..
Mega Tough infantry? German Fallschirmjaeger, Brit Para's, American Airbourne.
Armour lists? Brit Guards Armoured, American Armoured Battalions, German Panzers and huge Russian Tankovy's.
Elites?
SS lists, British Commandos, American Special service Brigades and Russian Spetsnaz/ Guards units.
You literally have hundreds of options and no one Unit is totally superior to another due to the inherent balance in the Game. The points cost, list build all make for interesting options, you maybe inferior but have greater numbers, you maybe better at some things but have smaller numbers.
You need to consider what Period you are playing, and then front/ Theatre you wish to fight. I would suggest D-Day Late War because it is Iconic and gives masses of options. Otherwise Eastern Front gives longevity from
EW /
MW /
LW periods but will involve you or your father fighting as the Red Army.
You will discover some standout units in any Army, but you may never get them in every list. This is where starting with a simple army is better. I personally think a Tank Army is nice start, they are cheap (use
PSC) and you can build some pretty good lists. Add in some AAA and some Arty and you are all set. You should pay about £150 Max (usually alot cheaper if you use deals and hunt around) for a decent German Panzer or Allied Sherman Tank force with no infantry. Once you learn the mechanics you can then move onto infantry which take a bit more knowledge and skill to use effectively. (Plus tanks are easy to paint, Spray it with
FOW Spray, drybrush, decals on, varnish, Dullcote) Plus with tanks you don't need bases.
FOW is considerably cheaper than
40K, you can get some very good mega-deals from
PSC and FiB.
15 x Panzer IV (A excellent all round Mid-war / late war tank)
http://theplasticsoldiercompany.co.uk/index.php?main_page=product_info&cPath=1_22_24_50&products_id=213 15 x Shermans (the good old 75mm Sherman)
http://theplasticsoldiercompany.co.uk/index.php?main_page=product_info&cPath=1_51_56_57&products_id=216 21 x T34's (Russians get a Battalion everyone else gets a Company!)
http://theplasticsoldiercompany.co.uk/index.php?main_page=product_info&cPath=1_2_19_44&products_id=210 AAA and Aircraft, the rules have changed so they will become alot more prevalent. Remember that
AA Guns on Trucks/ Armoured vehicles can be used to kill light transports and Infantry so they have a dual role.