hey guys... i need a telephoto lens.. i'm thinking of getting the 55-200mm VR for $300. but i saw someone selling the tamron 18-200mm macro for $350.. which 1 so u think i should get? the tamron sounds tempting coz it means i do not need to carry my 18-55mm VR around if i got the 18-200.. so i now having a headach over which to choose.. care to advice??