I'd definitely take LT.
Total FF points left to score in their careers is too simplified of a method to use. I'd much rather get the #1 RB for three years than the #10 RB for 6 years, regardless of where the total points work out. With LT, you're a major contender for the next three seasons or so. With your favorite younger third-tier RB, you've probably got a starter for the next six seasons, but you need to work a lot harder on the rest of your roster to be a team to be feared.
Also, while it's easy to look back and say that Faulk shouldn't have been taken #1 at age 29, it's much harder at the time to figure out which young guy should have been taken ahead of him... Anthony Thomas or LT? William Green or Thomas Jones? Kevan Barlow or Brian Westbrook? McGahee or Larry Johnson?
Jackson is a reasonable argument against LT, but the gap right now is so huge and the future is unpredictable enough that I think you have to go with LT. Imagine taking Jackson, watching the LT winner win three titles, then having Jackson go Ricky on you or destroy his leg in a flag football game or shoot his ex-girlfriend.
Sure, you could imagine the opposite scenario just as easily, but I can't see looking past three years for RBs, and if you knew your league would only last three years, you'd take LT in a heartbeat.
I agree with everything you're saying other than the value you are placing on Steven Jackson. I think you are WAY off..."I'd much rather get the #1 RB for three years than the #10 RB for 6 years" - Is this the value you are currently placing on S-Jax? You HONESTLY believe he projects as the TENTH best RB during the average season over the next 6 years?
"With LT, you're a major contender for the next three seasons or so..." - but with Jackson you're not? L.T.'s estmated value SO MUCH more that we're thinking the pts. seperating Tomlinson/Jackson over the next 3 years is going to be what wins you Championships vs. not contending?
"but the gap right now is so huge"... I guess that answers my questions above. I think you're wrong. The gap is NOT huge. It's as big as it will EVER be because L.T. is coming off of an All-Everything season.
That being said, I totally agree with the people advocating drafting LT and trading him. It's his PERCEIVED value that is too juicy to pass up - not his REAL Dynasty Value.