I am looking at buying either a new iMac or Mac Mini, with 16gb RAM minimum. leaning on the side of the Mac Mini, as I fear the new iMacs may be difficult to service in the future. When using Parallels 8 with a Mac I understand that you need to allocate it a certain amount of resources in order to run Windows 7. May I ask if Parallels / Windows only uses these resources when a particular Windows program is opened or does it effectively permantly use the resources on start up? The programs I wish to use are very lightweight, namely Decoplanner (Diving Decompression software) and Microsoft Money.