It would mean more airflow within the cabinet. Incase you ever decide to use a multi GPU configuration it would generally be a good idea to have better cooling. It also would be able to accommodate an E-ATX motherboard (though that might not be really useful to you right now). Generally speaking, more space wouldn't hurt anyone if it comes at a reasonable price. If the Armor+ MX is not a lot cheaper than the HAF 932 I wouldn't buy it. There are very good mid-tower cases at prices lesser than the Thermaltake. However, cases are a personal choice. If you like the looks and features of the Thermaltake then definitely get it.