If I was building a new PC today, I would certainly go with the latest LGA 1151 Intel motherboards that support DDR4 memory and the new 6th Generation Core i7-6700K CPU which is the first to also support DDR4 memory in addition to hitting the 4GHz mark stock however you will have to watch closely when they are in stock as they are selling out every week right now but priced at the same as the previous generation.
Buying already built PC's is convenient but building your own is always a little cheaper and you build to your personal specs.
- LGA 1151 Intel motherboards $200-300
- i7-6700K CPU $350
- 16GB or more DDR4 Memory $120
- 3 Hard Drives $300
- OS 500GB-1TB - I would go with SSD or a Hybrid SSD drive
- Data/Recordings 2TB or more - WD 7200 Black drive
- Data/Samples 1TB or more - Could go with SSD if only for samples, otherwise WD Black to store Synth and Drum samples and misc file storage
- Medium range dual DVI or HDMI 2GB or more graphics Card $150 - Yes it does make a difference in performance vs using on-board video despite what many say.
- Heatsink and case fans $100 - Noctua are the quietest I've ever found and highly recommend them.
- 650 Watt or more PSU $100 - Corsair makes many where the fan doesn't spin unless its hot, highly recommend to reduce sound. I almost never hear or see mine spinning. In fact between this and the Noctua fans, I now only hear the Harddrives but not sure how to silence them.
Along with a new PC Case it would be around $1500 to build and is probably a better performing PC than any of those already made studio PC's.
Most likely by end of this year I will build a new one and that's the specs I will be going with. Although I already have most of these parts on my existing system, case, PSU, harddrives, fans, graphics card, cdrom so a refresh will come out around $600 for just the MB, CPU and Memory. Not sure how much of your existing PC is reusable but may save you some money.