when you say second lens which do you mean? The 50mm 1.8 is £69 from my local camera shop. If you mean the zoom then it does seem like a bargain.
As for macro, if you want a really cheap solution now, then i can reccomend getting an M42 50mm lens + M42 Extensions tubes + M42-EOS adaptor. Total about £20. Obviously it will be manual focus and manual apeture control though.
This is also the case if you want cheap quality tele lens. I have not bothered with getting a modern cheap tele like the 55-200 you mention because they are slow and not very good quality. Instead I have an M42 Carl Zeiss Jenna DDR 135mm F3.5 which is excellent and cost £30. Sharp wide open and built like a very solid thing... Obviously it doesn't zoom, autofocus or autoapeture, but i prefer quality over these things...