I have a Giant OCR-3 2007 model. I just began riding last summer and love it! I have added aerobars and pedals because I use the bike for triathlons but am looking to upgrade my wheels. I am trying to spend less than $500 for both the wheelset and tires and any other upgrades. My friend is more experienced and told me I might have trouble because my bike is an 8 speed. Let me know what you think all thoughts and suggestions are appreciated!