I'm waiting for Tiger and I'm a current Windows user.  I want to get my feet wet while waiting.  Which system is the best for low usage?   I would like a low-cost, used system for the living room.  Would want wireless internet capability.  Although I use Word and Excel, for this system I would use Apple's word processor and spreadsheet that would come with the system.  DVD is not necessary and I don't care if it's a laptop, iMac, eMac, etc.  Recommendations?