Best PCI / PCI-e Wireless LAN Card (g / n) for a Desktop

[Lohita]

Hi Everyone! I recently bought a D-Link DWA-510 desktop WLAN card and have been pulling my hair out over it. My PC runs Windows 7 Ultimate 64-bit, and I find that I generally get 50% connectivity when my laptop has 100% connectivity in the same area. Thus, I'm looking to chuck this one in the bin, and switch to something else. Would anyone have any recommendations. I'm ideally looking for 2: A Wireless G card and a Wireless N card.

Thanks!

 

[Lohita]

Another bit of information in case anyone asks: My current wireless router is a D-Link DIR-300.