Hi there Guys, Gals,. and other life forms,

I am looking to expand my toys,and pick up an Xbox. I see on eBay lots of them, and a some are rather new models with a Red Light of death? I'm assuming that is a major system failure. I already have a Nintendo Game Cube, and a Wii. I certainly want Wi-Fi so I can go online and play. Do these consoles have Wi-Fi built in like the Wii consoles do,. or do I have to get an external device. I do have several wired ports on my wireless N router, (D-Link DR-628), and I also have a 6 port Network data switch with a few available ports.
Now that I'm retired, (actually disabld, and on SSI after rather severe cardiac problems

), and on a very low fixed income, money has become a major issue, so I need to go the cheapest route I can find.
I have been building Desktop PCs and Macs for 20+ years, and repairing PC and Mac Laptops for about 10 years. If I were to pick up one of these "Repair or for parts" consoles, how difficult are they to repair? are they like a PC or Laptop to where I can determine what is wroing, and replace the module. or do I need to go into soldering and all? Can I simply replace Chips, Drives, etc like Laptops and PCs?
Thanks,
Jim.