But it increases the thrill of having to keep up defenses at the PD. It forces the police to have to keep a lookout for trespassing thieves or rebels, instead of them being able to sit and wait for the robbers/rebels. In a sense, it "ups the ante."
Adverting PD raid allows for PD members who don't want to just sit and camp PD all day be aware of a raid? Also, it helps staff understand who is involved in a PD raid, so then random people don't shoot PD members and say "yeah, I was raiding PD."
I bought this rig from Best Buy. It was a bit more expensive tho because I bought another 8 gigs of ram (only had 8 when I got it). If I was you, I would wait until the day after Black Friday sales. That was how I got mine for like $100 or so off retail price. Good luck.
Edit: colored and underline
Edit2: forgot to add info