I guess I should ask, what your situation is on the software side of things as an OS is necessary... (idk if you're upgrading from a previous tower, I assume you were) You mentioned monitors, but for a moment there I was assuming you meant displays. considering other peripherals, than yeah I guess you may come to spend upwards of around 1.2k$~ish.
250 - for a
cpu and after market
cooler (as a stock cooler may not be enough)
150 -
Motherboard
150 - DDR3
RAM
<100 -
Graphics / Unless you're looking to feed multiple displays at high resolutions, you can cheap out on this one.
<40 - Boot
SSD, they're getting cheaper by the day. $/gb rate is quite reasonable today. For the boot drive, you really will not need any more than a 60gb drive. Unless you plan to run games or other items unrelated to production : /
<75 -
PSU min 600w
<100 -
Tower case, with adequate cooling solutions. I love my xclio tower, 25cm dual intake fans push in alot of air
peripherals? If you wanna treat yourself, minimum get a G13 & G600 mouse combo... The G13 I program to perform various functions when navigating windows, my DAW, vid editors, etc. It has helped my workflow CONSIDERABLY, and for the cost of only 60$ new, it would be silly to not consider it. Unless of course there are preferable alternatives. One COULD use their keyboard, but I say being able to program any keystroke to the g13, versus performing finger gymnastics reaching for key combos on a conventional keyboard, is a plus...
Optical/Storage drives will vary. Again I suggest a larger secondary ssd for storage of DAW related samples etc.