Depends what you're looking to spend, but I highly recommend an M1. It's a reverse flow smoker and hastybake style charcoal grill in one. Both functions work great.
Just yesterday I did an all wood smoke on a Canadian bacon using the reverse flow stickburner. When That was done, I lit up a chimney of charcoal and charred hatch chiles and tomatillos for a salsa verde. When that was done, I grilled up some teriyaki chicken kabobs.