twisted is dead on! Great post!
Cost wise, the average clutch lasts about 100k (some many more, some many less, depends on driving style). Which averages 300-800 for replacement on a normal basic automobile (more on high end cars, less on cheaper one). which are easy to do yourself if you are mechanically inclined. Automatic transmissions should be flushed every 60k (ball park) and using a chrysler dealers quote for a minivan, $220.00. So cost wise, if nothing goes wrong, they are just about a wash as far as maint costs go once you hit 120k
Standards are thought to have a higher level of reliablilty, but then again, they are less common, so I would assume that they are at around the same percentage wise.
as with the gas mileage, some cars it's 100% true, manuals get better gas mileage, some models it's not. Some are around the same (even in cheap cars, like the Chevy Cruze Eco, it's 33 combined with the manual, 31 with the automatic, which is pretty close)
But if you like driving, a Manual is the only way to go in smaller cars, fast cars, well, it's preference. My Friend with his LS1 in his Trans Am and 6 speed manual would always lose to my LT1 Firebird with a 4 speed automatic. (my bird makes similar power, 331 HP and 320 ft^3 at the wheels)