Computer Question Regarding Wired Ethernet vs Wireless Connections

[Schneed10]

I know we've got some decent computer whizzes amongst us. I am not one of them! I've got a basic understanding but need advice:

Currently I have an old desktop PC located in the top floor of my house. Last year we had Verizon FiOS installed where the cable comes in the side of the house at the top floor level. It connects to the wireless router in my bedroom, to which the desktop PC is connected via ethernet cable.

We just finished the basement, and now I'd like to replace the old slow-ass PC, and put a new desktop in the basement. To do this, it would seem I have two options:

1) Move the FiOS cable so that it comes into the basement, running to the wireless router now located in the basement, and connect my PC via ethernet cable.

2) Buy a desktop with a wireless adapter, and leave the FiOS cable and wireless router where they are in my bedroom.

Option 2 is obviously easier, and I'd much prefer to do this, but I don't want to sacrifice connection speed. So my question is, would I sacrifice much in the way of connection speed by choosing to connect via wireless PCI adapter instead of wired ethernet?

Thanks in advance for the assistance.