Originally posted by ScreamingIdiot The reason I keep both an 80-200 and the 75-300 is because the 200 can be used without a tripod while the 300 cannot. This makes the 200 better for me on nature walks, while the 300 would be a pain in the butt to use that way.
The reason why you are able to use the 80-200 with out the tripod is the focal length and not the lens itself. Take the 75-300 and set it to the 200mm focal length mark and you should be able to use this lens hand held too - take it for a test spin and try it out. The K2000 has image stabilized sensor, so you should be fine.
I would sell off the 80-200 and keep the 75-300. The 75-300 is not the best zoom but it can do a good job, especially stopped down some. You should also be able to use the 75-300 in the 85 to 100 range as a portrait lens. It would not be the sharpest, but on portraits you really don't want razor sharp images anyway (clients hate to see every blemish and wrinkle).
The other two zooms, if you keep the Kit 18-55 can go and be replaced with primes, as Rico and other have indicated. You can look on ebay and craigslist for old film cameras with a 50mm f1.7 or f2 lens for no more than $50 say.
You can also go to KEH.com for lenses.
I have read (but not tried) that their BGN (bargin) or UG (ugly) conditions are actually very good. They grade using a collectors condition guide. For students on a budget its probably a very good buy. Plus, you can call them and tell them what you are looking for. They might be able to pull the lens and tell you what the glass looks like. A ugly body with clear glass is what you really want on a student's budget. Also, the Market place here on the Forum.