[Breeder]

Thanks for all the replies. I've decided to go for Perfect Disk 2008 Professional after evaluating it and also Diskeeper 2008 and O&O Defrag 10. A few comments on the later two. Alot of people seem to recommend Diskeeper but I don't like the idea of having the defragmentation process happening 24/7. I appreciate that its supposed not to affect system performance and also it can be set to manual anyway. But it kind of defeats the purpose of chosing it when that seems to be its selling feature. Also I wasn't that keen on the interface in Diskeeper. With O&O Defrag 10 there were a few things I didn't like. Most importantly defragging with it too far longer than with any of the others. I was using the Complete/Access method. Also even after running this several times it was showing that my system had a 42% fragmentation with clean install of Vista and applications etc. This didn't seem right to me.

Perfectdisk seems to perform best for me. In terms of speed, the interface, offline defragmentation and reduction in future fragmentation.

Thanks for all your help!