Thanks for all the above folks
IFR: yours is the voice of reason, but I am not a computer DIYer. However, I do know a computer wizard and he has offered to plan a custom built machine for a minimum outlay.
On the other hand I do like the sound of this RUMBUS lark and have had some e-mails from guys and gals who reckon it is the way forward.
I should point out that my new system is not exclusively for running FS2K. I am into photography and photoprocessing and my daughter is into graphics and DTP. A lightning fast machine with plenty of RAM and storage is certainly needed in this household. And youngest son is also into other computer sims and games that need good 3D graphics.
Will sleep on it for a while.
Meanwhile, who is coming to The Ash Bash, the PPRuNe conference at The Ash public house, Stansted, Essex, UK on May 20? All PPRuNers invited. Pints from me to all those who contributed to this debate. Thanks.
cheers SS