Okay, so I think I've thought of a better purpose for this machine, what I'm thinking is Carputer, which brings up all kinds of new questions. First of all I'm going to list what I think might be the best setup and reasons for why I think this (my reasons being the most important part because I want to make sure that I don't have some misconception on the capabilities of some component). Ultimately, I want to be able to take this case out of the car and then use it in the house as my home CPU and be able to game in HD on a home monitor.
Initial setup, what I'm starting with due to my limited budget. In starting out the main purpose will be carputer, so I won't be upgrading much but the case and the PSU:
250W automotive PSU: (seemed to be the best value)
M4-ATX, intelligent ATX automotive power supply, 6/30V - power your PC in a car.
+ enclosure: (will work great for mounting in a case)
M4-ATX SFX/ATX enclosure
+ case: (I think the shape and handle are the reason I chose this, it seems very convenient to have in the trunk and then just grab it out by the handle and bring into the house for a home CPU also)
Newegg.com - Thermaltake VF1000BWS Black Aluminum Front Panel/ SECC Chassis MicroATX Desktop Computer Case - Computer Cases
+ water cooling system: (I'm pretty sure this will be essential due to the hot summers and the lack of cold air access to the trunk)
Newegg.com - Thermaltake CL-W0075 Liquid Cooling System - Water Cooling
+ AquaBay M3 fluid tank: (it will be nice to be able to hold extra cooling fluid)
+ monitor: (my favorite because of value and I like the connections at the back of the monitor, instead of having wires coming out the back of the monitor, cleaner because you aren't hiding any unnecessary wires)
new 8 inch Desktop TFT LCD Monitor w Touch Screen + VGA
For the initial setup I won't upgrade MOBO or anything else because what I have will be suitable for the carputer. So, the first part is pretty straight forward, I guess when I upgrade this aforementioned system to be a carputer and a home computer is where the questions will start. Which I'll get into after I post this.
So as the title mentions, this is where I'm a bit confused on some of the concepts for the system I want in it's finished state. The questions are mainly based on the possibility of using two different power supplies (one for in home use that I just plug in and that will be suitable for the video card I use for at home gaming and the other suitable to power the carputer using the onboard video at 720p). Nevermind about crossfire or SLI as I don't believe I'll need to take advantage of that tech for this build.
These are the components that I am considering:
MOBO: (the one Trotter helped me pick out, I want this for the onboard video, value, and PCIe 2.0 slot)
Newegg.com - GIGABYTE GA-G41M-ES2L LGA 775 Intel G41 Micro ATX Intel Motherboard - Intel Motherboards
RAM: (sounds like G skill is the way to go)
Newegg.com - G.SKILL PI Black 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory - Desktop Memory
Video Card: (4870 for $170 is best value and I like that it has an HDMI connector instead of the adapter, looks like a good copper heatsink on it also)
Newegg.com - GIGABYTE GV-R487D5-1GD Radeon HD 4870 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFire Supported Video Card - Desktop Graphics / Video Cards
hoping to use current PSU, which is a Thermaltake 430w:
Newegg.com - Thermaltake TR2 W0070RUC 430W ATX12V Power Supply - Power Supplies
So for the PSU's, my first question is: will the listed PSU work with the vid card I want to use when using it for the home system and can I use 2 PSU's (one for car use and one for home use)? I was thinking about just using y cables to connect to each component, connecting one end to the home PSU and the other to the car PSU.