I am unsure which to get. Theres an 05 w/ 50k for 18k and an 06 w/ 16k for 21k. Which should I go with? Any big differences between the 2? I know most will say the 06 but I'm going upside on my gas guzziling Silverado and want to stay under 25k. I know I'll have a blast with either but just looking for some advice. Thanks in advance.