I just built a System for myself 6 months ago. With Solar in mind.
I wanted something FAST and also something that EFFICIENT ... Hard to do. But I think I accomplished it.
I surf the net on my 47" LED panel 1080P / Home-theater PC / game player / music server.
Works good for me!
------system specs
Cooler Master Elite 430 - Mid Tower Computer Case $55
Corsair Builder Series CX 600 Watt ATX/EPS 80 PLUS $65
MSI LGA1155/Intel B75/DDR3/SATA3 and USB 3.0/A and GbE/MicroATX Motherboard B75MA-E33 $70
Intel Core i3-3220 Dual-Core Processor 3.3 Ghz 3 MB Cache LGA 1155 $120
Corsair Vengeance Blue 8 GB (2X4 GB) PC3-12800 1600mHz DDR3 240-Pin SDRAM $40
Sapphire Radeon HD 7770 GHZ 1 GB DDR5 HDMI/DVI-I/DP PCI-Express Graphics Card $150
Total of 500 shipped from Amazon...
already had 3 TB hard drives and a copy of windows 7. I didn't want to take my full tower case with me when I moved so, I had to build a new system here. Couldn't be more than pleased it's faster than the rig I had on the mainland.
Got an amazing computer that sips power. You can do your own research but I spent a few months trying to narrow down what would work for me personally and it fit's the bill perfectly. I can play FarCry 3 and modern games like left for dead 2 etc...etc... @ 1080P. Will I play the newest games 3-5 years from now? Probably but at a lower standards. But I normally upgrade every 3-5 years anyway. So it's not a problem for me. If I was on mainland power and it was 10 cents a KW, I probably would have adjusted my budget a bit for the a system with more speed and less efficiency.
I built my a dad (also lives in hawaii) an AMD based system that I toyed with an AMD A-10 5800K Trinity APU. It burns as much power as the Intel based chip but even tho the GPU is very fast the 7770 is about 4-5X faster even tho it will burn 170 watts a full load. The efficiency of the 7770 is amazing at sipping less than a WATT of power when not in use.
Like a say, if I wasn't such a heavy Gamer (I'm not) I hardly play games on my PC. Because I don't really have the time to invest in it like I use too. I would have bought the A10. But when I DO play games I want the eye candy.
Also, get a damn good power supply that is efficient as well, since a crap PSU can burn up a lot of watts just on it's own.
I'll help you out and if you want to come by and see what I built no problem...
Just let me know!