The Quasar will be the most cost effective since it is AC/DC. It also has the highest discharge rate.
The Pulsar Competition does the most things all around, but some question the usefullness of the extra options like the discharge(only 10 amps) and the motor run in which shuts off sometimes with a mod motor. In addition, it requires a power supply.
The Millenium is a good charger, but the ones above are both better, but more expensive also. It too, requires a power supply.
The CE Pit bull may be a good choice to have in this list also. It does the same things as the Millenium but is a little cheaper. This also requires a power supply.
Oh, don't forget the Puslar sport. It is nearly the same as the pulsar, but doesn't have the motor run function and discharge. It is also DC only.
With this being said, I own the Pulsar Competition. I use the motor run in function to break in brushes and power my lathe. As for the discharging, I bought an Integy Reactor 30 discharger and I am happy with that.
Tower hobbies has the Novak N-power on sale for $75, so when you do your comparison, add that amount to the DC only chargers to get a good base on price comparison when comparing AC chargers vs DC only chargers.
Integy makes the quasar chargers and they are cheaper than the associated one. The new 16X7 V6 is the same as the quasar, but has a 30 amp discharge rate rather than a 20 amp rate. The 16X5V6 is the same as the 16X7 and quasar pro, but it is DC only. The 16X9 is a little fancier, but I don't know what it has that the quasar doesn't. WWW.speedtechrc.com
sells the integy chargers for a good price and www.kthobbies.com
has a good price on the others.
Sooooo, goood luck!