The great thing about Steve Gregg is he will honestly give you the arguments for the theological viewpoints he disagrees with. Here gives 19 arguments in favor of the pre-tribulation rapture.
You may also want to see Steve's classes on the book of Revelation.
The audio series also may be downloaded here.
Right click here and Save to download a student's detailed notes of Steve's eschatology series. They are also embedded below. His notes on this lecture are on pages 45-52.