Schurmy thats a great looking system and I can guarantee you that the monarch computers 3Dmark05 scores, which test the power of the PC, will be much higher than the Dells, also a stronger power supply will be more reliable, it won't be loaded with the BS that dell loads on the computer and sometimes even runs in the background eating up resources.
My only input in the conversation - Norton is good, but there are also 2 other alternatives that are a little less money, like PC cillin which you can download from newegg for cheap, or AVG free anti virus, it is what I use and it's excellent.
Pick one of those anti viruses,also download ad-aware and spybot on it for your anti spyware & run that on occassion.
You should consider getting just the tower from monarch, and go to newegg.com to get your monitor, mouse, speakers, office software, etc.
I personally like this monitor for the price, features & guarantee:
or this 19"