What component do I need? Just a mixer?

[xtremerunnerars]

Budget dorm room setup -- do I just need a mixer?

Inputs:
iPod
PC
Playstation 3

Currently have:
DAC: Nuforce uDac-2

USB native bit rate: 32, 44.1, 48, and 96 kHz, 24-bit
Maximum sampling rate: 96kHz
Resolution: 24-bits
Analog RCA Output = 2Vrms
Dynamic Range: 90dB
S/N Ratio: 98dB
Digital Output: coaxial RCA 75-ohm
Headphone output jack
Power output: 80mW x 2 @ 16-Ohm
Headphone impedance 16-300 Ohm
20-20kHz Frequency Response
USB Bus Powered, 80 mA/5V
Maximum power consumption: 500mW

Amplifier: TCA Gizmo

Output Connections: L/R channel speakers ; Subwoofer out (RCA connection) 
Power Rating: 25WPC x 2 @ 4 ohms

Speakers: TCA WAF-1

System: Two-way, direct-radiating system, vented enclosure with rear port
Finishes: Rosewood (wood veneer) 
Drivers: 
• Tweeter = .787” inch (20mm) dome tweeter 
• Woofer = 5.25” inch (133.35 mm) doped paper cone woofer 
• Crossover point between tweeter and woofer 2000Hz 
Frequency Response: 
• Port Open: 50Hz – 20kHz, +/- 3db from 65Hz to 18kHz
• Port can be sealed for wall mounting; will work with 80Hz crossover point
Impedance: 8 Ohms nominal 
Efficiency: 86dB (@ 1 watt / 1 meter)
Grill: Recessed; removable
Cabinet: MDF
Dimensions: 10.5" H x 7" W x 10" D (approx.)

I'm looking for an easy way to mix everything together (or listen to just one source) while keeping quality. I'd also take subwoofer recommendations! I don't want to spend more than $100 on a sub...hopefully not that much on whatever component(s) I need.

 

[BoredSysAdm]

What you want a receiver, but what you can afford is a audio switch:
http://www.eforcity.com/pothrca3swt1.html?int=efsechtxtrigos-item

Re sub for $100 ?? Look on craigslist for used ones, I don't know anything even semi decent under $100
The only sub comes to mind is Dayton Sub-120 - used to be sold for $120, but now it's $150


p.s:
http://nwavguy.blogspot.com/2011/02/nuforce-udac-2-drama.html