Camacho Corojo Churchill (under $7)
I prefer at least a 54 ring gauge or larger, and at least 6 inches long (6x54).
On the stronger side I like the Perdomo Maduro 6x60. On the more expensive side, I occasionally will splurge and fire up a Rocky Patel Decade, expensive but muy tasty, slightly milder than the Perdomo. I also really like the Saint Luis Rey Serie G for a milder smoke, good value.
Someone mentioned finding a cigar store with a good owner who will talk to you. Excellent advice, especially if you find a place where you can light up right there.