I use a Sigma 55-200 with decent, limited results. Stop up, expose properly, and it can turn out fine enough images. $150ish. Its already not a fast lense, so stopping up is not always an option.
Your best bet, would be to save more money.
Olympus E-1 & E-420
Zuiko Digital 8mm FishEye(f3.5) ED
Zuiko Digital 11-22mm(f2.8-3.5) ED
Zuiko Digital 25mm Pancake(f2.8) ED
Zuiko Digital 50mm(f2) ED
Sigma 55-200mm DC AF(f4-5.6)