No matter where you buy a Fujitsu-Siemens PC from, it's going to be right load of bab

Really, been running a Fujitsu-Siemens laptop for the past 15 months as my own with no issues at all.

I'd go for a Dell, or an HP Business Desktop

I would go with Dell, any HP I have dealt with have all had dodgy power supplies.

http://h10010.www1.hp.com/wwpc/uk/en...-12386404.html

I install loads of these and they're rock solid, and unlike the dell's, you can upgrade them yourself when the time comes. Dell machines dont have any additional HDD bays or anything

I have a Dell workstation at work that has been upgraded and added to in its original casing. It all depends on what casing you have. If its a SFF then no you cant, if its a regular desktop/tower then you can.