help with pistons and question

http://store.summitracing.com/partd...K285NCP30&N=700 0&Ntt=TRW~8K285NCP30 or UEM~KB167030~8&Ntk=&rsview=sku&Ns=

or

http://store.summitracing.com/partdetail.asp?part=UEM-KB167030-8&autoview=sku


or

http://store.summitracing.com/partdetail.asp?part=FEM-CSMHP808-300&autoview=sku



which pistons out of these two?
How is speed pro?
Any other suggestions? dont wanna go broke LOL
what is the standard bore for 68 318?
what would these 3.940 bore be? (is that .40 over)
How are Federal Mogul pistons?