Images server specifications - VPS

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http://serverfault.com – I'm currently run a few hobby sites. One of the sites has a lot of image content and I was thinking of planning for the future. As the hosting plan I'm on doesn't include a lot of bandwidth I was thinking of investing in a vps to serve image files for my website(s). I'm on a budget (aren't we all) and I'm wondering what would you rank in importance for serving only image files (jpegs mainly)... CPU // RAM // HD I/O Speed? Currently across my sites I get around 1000UV/day which isn't a lot. I wish to plan for 4000 UV/day and 8000UV/day with an average of 10 pages per visit. Each page having (HowTos)