OCZ 120GB Vertex 3 SSD 2.5" SATA-III 6Gb/s Read 550MB/s Write 500MB/s 85,000 IOPS
Is Good, 85000 IOPS is the important part. 135£ Random Write 4KB: 60,000 IOPS
OCZ 120GB Agility 3 SSD
this to has 85000 IOPS 115£ Random Write 4KB: 50,000 IOPS
Corsair 120GB Force 3 SSD
also 85000 IOPS 115£ but no Random IOPS Figure
So the one you chose is the best drive here, however you could save £20 and just loose Random IOPS of 10,000 :/ its up to you...
and yeh - if i carnt find any information, its going back, becasue 30Gb is alot of space...