If you are thinking of the MFT, I believe the 10% off promotion also applies to the "combination packages". Festool offers a package with the TSxx saw and MFT for a slightly reduced rate. The 10% off the saw is then also applied. Through a dealer you *might* also be able to get a different rail with each for the difference in cost. Make sure you think about your needs and ask the dealer you use.
With that said, I just received my second MFT, bought via Uncle Bob and the closeout inventory. Since my MFT is not going to be transported much, weight is not a worry, and I like the larger table size. I'm 6'1", and the MFT1080 sits a little low for some activities, but I have the option of raising it on some simple risers. When I am working on something taller, I am finding I appreciate the low stance. For example, last night I was attaching the rear slats on some adirondack chairs, and the 1080 puts the chair back just at the right height.
So, another option for you is a TSxx, with 10% off, and a MFT 1080 for only $414 ($161 cheaper than the MFT3). The only drawback I know of is that the future accessories and what-not are made for the MFT3 profile (but most of those are NAINA anyway!), and the MFT3 has a cross-bar accessory for firming up the frame.