Thanks so much for the detailed advice! I think im definitely leaning towards the Mobo/CPU and then RAM upgrade path, for now the Wifi is decent enough for me as the D/L speeds are stable enough and I dont play online games, so latency/ping etc arent a major factor for me.
Yeah dude, the house is not mine, so im not about to start making holes in walls, or have cables running around the floors. Thanks for the suggestion though! :)