You may already have your disk mode set to AHCI.
If you don't, there are benefits to running in this mode even with a standard HDD. You can change the mode before you clone with no issue if you follow the instructions in the MS knowledge base:
http://support.microsoft.com/kb/922976
Go to the 'Fix it myself section' and follow the instructions. Even though you're not fixing anything, this is what you do to switch disk modes in Windows. After you do this, you go into your BIOS and change the disk modes of each of your motherboards disk controllers to AHCI.
Just note, you'll need to change the settings in Windows first, then restart, go into the BIOS and change the setting for the disk controller(s).
About the Steam saved game info... there's probably something on Steam that let's you know how to save your save game data when you update or buy a new PC.
Also, I recommend putting Steam and the Steam games on the HDD because it is larger and your game library will continue to grow. You don't want it limited by the size of your SSD. At some point in time, in the next few years, the drive capacities of SSDs will increase and you'll be able to affordably swap out the large HDD for a large SSD.
Cloning works so well, you don't need to do a clean re-install. Here's what I recommend for best results:
1) Free up the disk space so your HDD can fit on your SSD. Your HDD needs to be less than the capacity of the new drive for sure. I would shoot for 220GB because we know all hard drives have far less capacity than they advertise. The 256GB M4 I'm currently using has a real capacity of 238GB. You need to get your HDD down to 220GB or less, so you have some swap space on the new SSD after the clone.
Delete unnecessary data and save the stuff you want to CD/DVD, external drives or some removable storage.
2) Change your disk mode to AHCI prior to the clone on all disk controllers on your motherboard (
http://support.microsoft.com/kb/922976 )
3) Restart Windows, go into the BIOS, and change the disk mode for your disk controllers to AHCI.
4) Clone the HDD to the SSD using the kit - Don't forget to check the '4K alignment...' box
5) Remove the old HDD and make sure you can boot to the SSD and everything is working fine.
6) Format the HDD for use as a data/app drive. You can use the kit to do this... just hook the HDD to a USB port with the sata-wire. It will load as a removable storage device. Format it using 'quick format' then install it internally.
7) Figure out the saved game data issue with Steam and save your games to the appropriate place.
8) Uninstall the steam client from the SSD.
9) Install the Steam client on the HDD.