I never knew it was so tough to try and get through watching all the X-Files episodes - am almost half way there but I've got a lot of other DVD box sets to watch, including:

24: Season 6 [original copy was faulty]
My So-Called Life: Complete Series
The OC: Season 1 and 2

Also planning to watch all the CSI episodes again when that's done - that's 345 episodes so far - and I've still to get CSI: Season 8 [17 episodes], CSI Miami: Season 5 Part 2 [12 episodes], and CSI NY: Season 4 [21 episodes]