Yanks 2nd edn and Hatten. Yanks is a gotta-have item for getting beyond the Shermans and goon squads of ASLSK. Some of the hefty stack of scenarios require boards not included in Yanks + BV, but no gripe about that.
Hatten is a beaut: oversized hexes, winterized artwork, durable components, cool subject matter and box art. Eight scenarios should be plenty to get going even without CG admin work. The sum of my previous CG experience is Decision at Elst, but I found Hatten's rules intelligible and straightforward. The terrain and weather are simple. Play ought to run smoothly, without lots of reference to lesser-used rules or much fiddling with prisoners. Both sides have fun assortments of troops and equipment, and there's something especially nifty about flamethrower-panzers on a snowy day.