amigazone,
Hi... I have noticed that OS4.0 Is Now Ready...
I have been away from the Amiga Platform for some time but realy wanna get back...
Well, that depends on whether you want to get back the Amiga Platform, or if you want an Amiga-like nextgen OS like OS4.
If you want an Amiga, you can generally find them in a local thrift store or flea market for less than you would pay on Ebay, although they are very common on Ebay. If emulation isn't a problem for you, then WinUAE may be an answer.
If you want a new Amiga-like OS, then OS4 is pretty much out of the question at this time unless you find a used AmigaOne. AROS is probably your best bet because it runs on a regular PC, thus you can circumvent all of the known hardware problems with the AmigaOne, plus it's free.