Best way to do this...

Hello, Currently my PC has an HDD (1Tb) with two partitions. There's C: (OS) and D: (games). In a couple of days I'll be upgrading my PC and I'll add another 1Tb HDD. I use Acronis True Image to create backups (images) of both partitions. I want to leave C: on the old HDD and put D: on the new one. My question is: What's the best way to do this? Should I connect just the old HDD, boot into Windows (7 Ultimate x64), get rid of partition D:, connect the new HDD, reboot and only then restore the D: image created with Acronis or is it OK to connect both HDDs from the start? I'm worried with the assignment of drive letters... All my games (including FS9 and FSX) should stay in drive D: to avoid problems... I've downloaded a freeware program called "MiniTool Partition Wizard Home Edition". Is this any good to help me do what I want? After deleting D: from the old HDD, I want to expand C: to the full size of the drive. Any tips welcome and thank you in advance.