Connecting through wireless

I currently connect to my DSL with a cable but want to go wireless (already have a wireless router).
Can anyone tell me what I need to add to my computer so it will work this way. Assuming price is no issue (within reason) feel free to recommend the specific item. Here are my specs

CPU: Intel Core i7-920 Bloomfield 2.66GHz 4 x 256KB L2 Cache 8MB L3 Cache LGA 1366 130W Quad-Core Processor
MB: Foxconn BloodRage GTI LGA 1366 Intel X58 ATX Intel Motherboard
PSU: CORSAIR CMPSU-750TX 750W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS Certified Active PFC Compatible with Core i7
Memory: CORSAIR XMS3 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
HD: Western Digital Caviar Black WD1001FALS 1TB 7200 RPM 32MB Cache SATA 3.0Gb/s 3.5"
Display: ASUS VW246H Black 24" 2ms(GTG) HDMI Widescreen LCD Monitor 300 cd/m2 1000:1 (ASCR 20000:1) Built in Speakers
GPU: XFX HD-489X-ZSFC Radeon HD 4890 1GB 256-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card
Optical: Sony Optiarc Black 24X DVD+R 8X DVD+RW 12X DVD+R DL 24X DVD-R 6X DVD-RW 48X CD-R 32X CD-RW 2MB Cache SATA DVD Burner with LightScribe LightScribe Support
 
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