I just came up with a few dummy tests though; nothing long or serious, but here's what I got (these were all done on live in my current gear, with DB, MA, and 500 Int Flask; http://us.battle.net/wow/en/characte...blast/advanced)
ST: ~160k with INCREDIBLY LUCKY strings of Crits
*Cleave (forgetting to use Invo): 170k on 3 targets
*Cleave (using Invo): Peaked at 200k on 3 targets
* Was only done for one cycle of Invo; it was just for fun and to test my pull DPS
While these numbers aren't that reliable for anyone, it's more or less an over-sim.
Regardless, once you get geared, Fire gets really nice; even nicer as you get the T15 bonuses. The T14 bonuses are eh. 2P is 8% Pyro damage, which is nice, but the 4P T15 is 5% Crit (way nicer), and the 4P T14 is worthless if you're using AT, while the 2P T15 is 1800 Crit, Haste, and Mastery after using AT, which is huge for our second string of Pyros.