I'm a huge fan of the Veresov. Check out A Ferocious Opening Repertoire. It revolves around the moves 1.d4 and 2.Nc3 in response to any black opening. The mainlines are the sketchiest (still fun, but not "secure" or perhaps entirely sound) but if black tries to avoid the mainline he's essentially walked right into your "trap" because those "avoid the mainline" lines are terrific for white. You can basically play the same way against anything.
If you want a concise system, with time backing it up, it is the Veresov. It still survives the test of times. It is a direct and very energetic way of playing. THere is a bunch of excitement in the main line and in the deviations. Get that book if you are looking for a shorter repertoire which still packs a decent amount of venom.
Ive never heard of the Veresov before, Ill see if I can find some stuff on it.
1.e4g5 2.d4Bg7 3.e5c5 4.Bxg5cxd4 5.Qxd4Nc6 6.Qc5Nxe5 7.Nc3d6 8.Qb5+Bd7 9.Qxb7Rb8 10.Qxa7Rxb2 11.Be2Nc6 12.Qe3Qa5