I'm a 34" waist (normally get 36" jeans so they're baggy), and 6'3 tall. I have older Ronin pants in a XL and they're just a little bit bit baggy on me, not huge. I'd get XXL if I got Ronin again. A friend of mine is about 5'7 and has XL Ronins too and they look really nice on him. The waist has internal velcro adjustments so you can get a size bigger than you normally would and pull those tight so it all bunches up evenly all round just a bit so it still looks and fells good. Hope that helped.
Do not fear the eBay. I got a pair of brown, size small, and brand new 2005 FourSquare pants for $35. They're worth about $150. Look for auctions that end during the morning on weekdays. You can get incredible deals.