Originally posted by Stermtrooper I don't mind trying scour the lands of eBay for lenses I just am not efficient at winning bids. I'm a buy it now kinda guy when it comes to eBay.
Try a sniper service like
http://www.ezsniper.com Gives you a much better chance of winning and you might land a real bargain.
BTW, I agree with the suggestions for Pentax DA 16-45 and 55-300. Both outstanding value at less than $200. The extra width of the 16-45 (compared to the usual 18-xx) is much harder to come by than the 46mm-54mm at the other end. The 55-300 is very good for birds and other wildlife. Neither is especially fast (ie maximum aperture is not really wide), but good wide open. Fast lenses with AF, like a 70-200 f2.8, cost a lost more and are also larger and heavier.
If you have enough change left over, get a small cheap prime, like the manual focus Pentax-A 50mm f1.7 (readily available for about $50-70) or the autofocus DA 50 f1.8. Either is excellent for portraits, low-light shooting, for short depth of field and (with an extension tube or close-focus filter) for macro. It will complement your zooms perfectly. The DA 35mm f2.4 is another excellent cheap prime; although it is not as fast as the 50s, 35mm is a more versatile focal length.