You CAN get Office for the Mac!
The programs are identical to the Windows versions, and 100% compatible. The Office 2008 edition for Mac (Home/Office edition) is currently on sale at Apple Stores for $98. I will say, however, that the 2008 edition gets some pretty negative reviews for being bloated, slow and crash-prone (I guess that's what you get for introducing Microsoft into the Apple world!). What I did was buy the Office 2004 version for Mac -- you can find them around, cheap -- and it works great.
Another alternative is NeoOffice (http://www.neooffice.org/neojava/en/index.php), which is a full, open-source (i.e., free, downloadable) office suite for the Mac. It is fantastic -- and also fully compatible with Microsoft Office programs.
There really are no compromises left when it comes to switching to Apple.