Hee are some Hungarian pak 40s, same paks as my FJ use actuallly, simply magnets attached to the underside of the paks and hiddden in the bases. Works a treat and saves buying more pak 40s (I have far too many as it is)
Next up, some 149mm M14/31 howitzers. For 225 points you get veteran artillery: AT 8, RoF 1, Range 16" fire power 1+, bunker buster or firing as artillery: range 72", AT 5, 2+. No smoke bombardment but potentially pretty damn effective if you ask me.