ha ha - ah great! I wasn't thinking of ebay at all! 
I've thought about building a tower but wanted to know if its really worth it?
I have a A1200 (with ACA1233) and a NG (Sam460cr) - both giving me what I want but the child in me as considered doing a tower.
I've read though that they can be a little unstable and you really need to know what you're doing.. obviously getting the additional hardware can be tricky and expensive too...
Can I ask would you bother doing it considering what I have or what is it that it gives that's worth the extra effort?
Thanks in advance!
Well biggest advantage would be to fit a mediator and a graphics card and maybe a network card etc. Also the space allows for more hard drives and a large optical drive (if you have 4xEIDE'99, FastATA etc), there are some accelerators that do not really fit well in a wedge (either because of the cooling or SIMM slots etc), there are a lot more hacks and modifications taht can benefit from a bigger case but these are a few.
So if someone wants to expans their A1200 a lot and add a mediator a tower case is pretty much a must.