div's v tables does not matter, as mentioned above however code size does as it effects load times. Every extra byte adds up on your file sizes. Use style sheets and minimize them by using one of the many online compressors. (dont save them over your original though) Same with javascript files get them out of your main HTML pages and minimize them if you use javascript. Strip out comments etc that are for you and not your end users when you publish the files.
I have never seen a site rank higher because of the the technology they have used unless it effects loading times.
Good SERPS is great, Traffic however is even better
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