Hi:
I am upgrading my router and have three criteria: longest 'useful' distance, reliability, N-dual band simultaneously.   I know the 655 does not meet the last one.  I can remove that.  However, I've been reading all over the web about the lockup problem.  It almost seems like a crap shoot as to one being affected by this problem, actually the odds seem to be 0.55 not having it, 0.45 having it.  So, it seems to be a problem with 1.3* firmware, July 2009.  Question is: Are any of the previous versions better?  I think 1.2 does not allow one to go back to earlier versions.  
Next question: What would you suggest to replace this model? (D-link or other mfg). BTW, i would buy the linksys 610n but it does not have external antennas, another requirement (helps with the longest distance thing as I do use an external hi-gain antenna...(hoping the new router eliminates that)).
Last question: the 655 is not supported by dd-wrt (pity)....anybody have any experience with any Dlink model and dd-wrt?  good/bad?  
Thanks for any advice....
John