Ive never had a problem with Ebuyer, Even when having to return stuff. They arnt the best to deal with but Ive had worse (Aria for one) I dont think ive ever ordered from aria without at least one thing beeing DOA, except once and that died about a week later
Though I will admit that the whole RMA process to aria was done via email and quite quickly, they actually had to wait for me to post the item for a few weeks as I didnt have the money available, It was a WD caviar 60gb 5,400 RPM wich they didnt stock anymore by the time I returned it, they sent me back an IBM 60gb 7,200 RPM instead wich was worth £15 more, Wich was nice
To summarise allthough aria seem to treat RMAs better, the frequencey they occor more than makes up for it.
as for your system I would reccomend any Nforce2 mobo (Preferably ASUS)
and an Antec, Chieftec or Thermaltake case (All pretty much the same case anyway)