Great list, Jeff231. I totally agree. Beyond those products, it all becomes tuning the parts on your bike for your personal preference, like bar width and angles, bar height, stem length, which brand of pedals you're comfy on, which saddle you like, tire inserts if you want them, etc. And those items aren't really about "upgrading" as much as they are about tuning. For instance, there are $45 saddles that feel better than $160 saddles (cough cough Giant).