Quality OL can be found in every round but I think those 2 teams are a bad example. IMO the success of those two offensive lines is smoke and mirrors. Let's look at the Eagles since they have the #1 ranked offense this year.
LT Jon Runyan 4th round pick
LG Shawn Andrews 1st round pick
C Jamaal Jackson UDFA (from Delaware State)
RG 4th round pick
RT 1st round (11th overall)
They also have early 2nd round rookie Winston Justice waiting in the wings.
Yeah, but they can't run the ball, either. They pass on something like 70% of their offensive downs. That's a truly bad example to use. Look at the San Diego Chargers' offensive line:
LT - Marcus McNeill, rookie 2nd round pick
LG - Kris Dielman, UDFA
C - Nick Hardwick, 3rd round pick
RG - Mike Goff, Free-agent signee, 3rd round pick
RT - Shane Olivea, 3rd round pick
This isn't breaking the bank on guys; it's building a group and letting them play together. You won't find a better, hungrier bunch of players in the NFL.
And what about the New Orleans Saints? A team that can run the ball and pass the ball with great efficiency? How's their offensive line made up?
LT - Jamaal Brown, former 1st round pick
LG - Jamar Nesbitt, free agent signee, 11 year veteran, former UDFA
C - Jeff Faine, free agent signee, former 1st round pick (21st overall)
RG - Jahari Evans, rookie 4th round pick, former offensive tackle
RT - Jonathan Stintchcomb, former 2nd round pick
Faine wasn't a marquee signing, but the team knew what they were looking for and got themselves a player. I bet that these guys aren't in the Top 10 in spending along the offensive line, either. I don't think Brown was even a Top 15 selection.
Heck, look at the Bengals, another team with a complete offensive attack:
LT - Levi Jones, former 1st round pick
LG - Erick Steinbach, former 2nd round pick
C - Rich Braham, 12 year NFL veteran, former UDFA
RG - Bobbie Williams, free agent signee, former 2nd round pick
RT - Willie Anderson, 11 year NFL veteran, fomer top 10 pick
It's not just about loading up on high picks. It's about knowing what you want to do with the players that you have, and finding guys that are going to fit your system.