Zoom lens conundrum!!!

[master of none]

I'm an amateur shutterbug and just received a Canon EOS 50D as a gift. Sweet! However, I have found myself in a quandary regarding zoom lenses. I have an old Vivitar Series 1 28-300mm f 4.0-6.3 lens but also have the lens that came with the EOS 50D which is a Canon IS 28-135mm f 3.5-5.5. I'm trying to decide if I keep both of them, or do I hock one to get a different lens. I do almost all outdoor stuff (no macro or portraits). Because the Vivitar is 77mm and the Canon is 72mm, I don't want to have to buy a bunch of accessories, filters, etc. for each lens. The Canon lens is obviously newer with more bells and whistles (like IS and ultrasonic) and is a bit faster, but the Vivitar has the extra 100mm of zoom. Unfortunately, they're the same on the wide angle end of the spectrum. Since I do quite a few landscapes, do I hock one for a wide angle? Do I get a drop-in filter system like Cokin to keep them both? Thanks so much for any advice!!

[Don Fischer]

Well for what it's worth. If you wanted to sell the Vivitar, it probably ain't worth much, My guess is it's worth more to you as a shooter. If you sold the Canon lense, you sell the best one you have for what? For about $300, Canon has a 100-300 zoom lens, that's less expensive, notice how I avoided saying "cheaper", than Sigma's 100-300. That and the 28-135 that came with the camera sure cover's a lot of ground! And if you just want to go walk about, the 28-300 Vivitar covers the same range but probably not as sharply, but, your only carrying one lense. There's no reason to have a $5000 lens if you have $200 technique. I got a lot of $200 lense's!