
the heading reminds different things 
being lazy ,I generally dont partition big drives (if you want to save space, also you need to change the default cluster size).. another reason is : all softwares you install have the default drive as C: and you need to change the path everytime .. :-/
but SSD drives are worth the effort..will effect the performance seriously.. 
I realised I never need a drive above 10/15GB for what Install, I often used to install all the big programs on a 2nd drive/partition like office and autoroute plus my games etc
Of the drives listed only 2 of them show cache sizes boith of which are far higher than the current 1TB with 32mb cache that I buy at the moment.
My other option rather than 64GB/64Mb/£163 is to go for 2 x 32GB/128MB/£100 and raid the boot drive, but I dont know what the pluses/minus are as I have nevr tried a raid boot system.
Also my typical install sizes mantioned are based on XP Pro, I will probably be upgrading to Vista and have no idea on space/systems/programs space required.
I would buy one drive at a time and compare performance, I dont have a problem with the cost of 2 @ £163 but would be happier if they were cheaper.

May it may be worth getting one of each and doing speed tests to compare. But AFAIK I cant raid 2 different drives (or can I)