In short, I want to buy pci (not express) wifi adapter for my desktop. Please answer the questions: 1> what is N 150 and N 300, which should I get ? 2> 802.11 (b vs g vs n vs b/g/n) please explain this and does this cause any compatibility issues with wifi card ? 3> Any other thing I should know before buying one, that may cause compatibility issues or any thing else ? **My motherboard is DH61WW (the pci express slots are used), operating system is windows 8.** Thanks for any help.