I like the Illusion better for $10 more. You get 3 large LED fans.
The case will be housing my:
Asus P8P67 mobo
intel i5 2500k CPU
Gskill 8GB RAM
WD 500gb HDD (main drive)
NVIDIA 9600 GT 512mb card (will be replaced with a better on soon)
Windows 7 64 bit
Antec 500watt PSU
I use the Illusion as my "go to" case for builds that do not need a full tower. It looks good, cools well, and is high quality. I have used it in over a dozen builds for friends and family. It's a great case. I have a 1200 so you can tell I am an Antec fan.
Antec 300 Illusion is newegg and newegg.ca specific. Show me one for sale anywhere else.
The Antec 300 comes with 1 x 120mm exhaust fan and 1 x 140mm top fan. The Illusion adds 2 x 120mm intake fans to that. Antec TriCools are $16 on the egg making the Illusion a much better deal for $10 more overall.