best atty for big mods?

[flashpoint]

I'm on week 3 with a DSE901 and realize I need to upgrade. Tomorrow is payday, but I'm wavering between a Chuck, Prodigy or just a USBpass to get me by - I'm in a car or office with USB available most of the day.

But here's the rub - I cannot find a direct comparison between 501, 801 and 901 attys and all the mods come with those options. I need to order more attys too, so all options are on the table.

What are the differences? Does one model have a longer life than another? I'm not totally thrilled with the 901, but I expect the manual button on all three mod options to solve the problem, so I really just want opinions on the best atty.

I have not gotten a handle on topping off carts and have moved on to dripping. I'd like to stick with dripping - less junk to carry around, especially after I order an e-dobit.

If this has been addressed somewhere else, please post the link!

[doots]

if youre going to drip primarily use the 801/ 510 is too small/ 901 I dont personally like but would be ok in a high volt model im sure. I use 510 @ 6 volts and love it w/ carts.
I use the 801 to drip @ 6 volts. Works great!