I have exactly what you are looking for.
The games on the account are: CSS, Garry's Mod, Half-Life 2, Half-Life 2: Deathmatch, Half-life 2: Lost Coast
The only problem is that it's a 7 digit, hope that doesn't change your mind though. If you are interested, add me on MSN at [email protected] if you don't have MSN send me a PM on here.