You can now pre-order the Digital Download version Grand Theft Auto V for the PC via various stores. Here is a brief round up of where you can get the game from and what benefits they include.
First up is the Rockstar Warehouse, getting the game directly from Rockstar themselves means you'll be supporting Rockstar fully and will only have to deal with one set of DRM (Rockstar's Social Club), plus if you pre-order by February 1st you will get $1,000,000 in-game ($500,000 for Grand Theft Auto V and $500,000 for Grand Theft Auto Online) and an additional $300,000 for Grand Theft Auto Online. To sweeten the deal even more you will also get a FREE Digital PC game of your choice from their store.
Second place you can find a pre-order would be Green Man Gaming, where if you pre-order by February 1st you will get $1,000,000 in-game ($500,000 for Grand Theft Auto V and $500,000 for Grand Theft Auto Online) and an additional $300,000 for Grand Theft Auto Online, and a bonus digital download of Grand Theft Auto: San Andreas on PC. This game will be delivered as a Rockstar Games Social Club redemption code. Customers will require a free Rockstar Games Social Club account to play. Grand Theft Auto San Andreas will be provided as a Steam key.
Third place you will be able to find the game digitally is the well known Amazon.com, which includes the same pre-order bonuses as Green Man Gaming. (Please check Amazon in your own region for more details.)
Grand Theft Auto V for PC will be available for pre-load prior to release.
(Most of you will probably just buy it on Steam anyway.)