Need Advice! - Gaming PC microATX/mini-ITX SFF?

Hey guys,

So I'm trying to put together a PC that I will be able to travel with. I have a laptop already, but find a lot of latency issues and lagging that I don't want to deal with with gaming and performance. I really don't want to get another laptop. What I was thinking about was building a PC that would be small enough to travel with me, but also be powerful enough to do mid-high gaming and otherwise be a stable computer. Air travel, btw.

Approximate Purchase Date: Sometime in the next two-three weeks. The earlier, the better.

Budget Range: $500-700. Could be talked into more, however.

System Usage from Most to Least Important: Surfing the internet, checking emails, facechat, gaming, watching movies

Parts Not Required: keyboard, mouse, monitor, speakers, OS, power supply **IMPORTANT** The power supply I have is an old 2002 era 250W power supply. I just found it in an old Dell computer I have and I was considering using it, but I realize this might be a terrible idea. I'll put the make and model up later. **ALSO** Monitor advice would be appreciated. Should I get two for both locations I'm traveling to? Or is it possible to find one sturdy enough for travel?

Preferred Website(s) for Parts: newegg.com

Parts Preferences: I'm usually biased toward Intel, but I could be talked into AMD. I want to get the case as small as possible while still being powerful and upgradable.

Overclocking: Maybe - probably not, unless it is necessary

SLI or Crossfire: Maybe, depends on build

Additional Comments: Would like it to be pretty with LEDs and open panels (BLING!), would like it to be as quiet as possible, but the most important thing is that it is A) Small, B) Powerful, C) Adequately Cooled.