Uprade path with New 64 Bit PC w/Old XP

I had decided to start afresh and buy all new MOBO/AMD 64 5200/4GB DDR2 but I could not afford the XP Pro 64 yet.
So, I am going to re-install my XP Home or Pro (undecided).

I have A6 Extra and will be upgrading to A7 near end of year. Should I wait to install the A7? Or, just start out with my A6 on my new pc rig? Is there any conflict with having the A6 installed and installing A7?

TIA

A6 also runs under XP 64, so installing it until you get the new version will be fine. There is no conflict with installing A7 over an old A6 version.