If you prefer mobile combat and you want avoid grinding battles and with long campaings east titles are better option in general.
Stalingrad42 is a classic to enter in the serie, you have summer and november combats offering enough big actions more focused in movement because the city combat even when is present is not necesary something you are going to play.
Kharkov42 and 43 are 2 good titles to and offer mobile combat to.
If you want some west action... Bulge44 and France40, this 2nd title offer a monster campaign and compared with Normandy44 is a lot more mobile, bulge has a "smaller" campaign but is usually a loved title for guys from the other side of the ocean
For me, other good titles are Budapest45 (the only one covering last year of war... but this could change in future hehehe), Tunis43 and Sicily43... even i can add Salerno43 but all them are titles with non monster campaigns but offer a good set of middle size scens.
In general every title offer scens you are going to enjoy (Minsk44, Moscow titles, Smolensk...) if you have interest in a campaign battle try this.
Buy them in the pack made you have one title for free... i do this one time to have a 5th title as gift but i dont like a lot how works the discount model in Tiller games because i buy titles i like when are released and wait to buy 4 is
and could not be an interesting 5th title avaliable... here i prefer every time you buy a game receive a discount code of 5%, in the end 20% / 4 titles = 5% something i see more flexible to buy without hold until you are going to buy 4 games... in the discounted titles simple dont offer the discount code when buy one.
PD: if you are going try buy in pack you could add one of PzB titles... Normandy and North Africa are a good complement for PzC with a smaller scale... FWW is another good serie but is better you test it... i dont know why the serie lacks a demo.