I've been owning my '07 E70 since it was a new and the mileage is about to hit 50k already. how are the extended warranty and CPO warranty different? I'm curious about a maintenance warranty as well. What should I buy before my current warranty expires. Some people mentioned about the third party warranty companies to get it at lower cost. I AM CONFUSED!!!

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'07 X5(E70) 3.0si - Space Gray / Nevada Gray interior
Specs: Premium | Tech | Premium Sound | Comfort Access | Rear Climate | Custom Chrome Plated Grills | Style 168 22s w/ Sumitomo HTR | MTEC Cosmos Blue Bulbs (H8: Angel eyes, H11: Fog light) | BMW 4.8 Chrome extension exhaust tips (will be delivered from Germany and installed in Feb 09)
'05 645ci(E63) - Titanium Silver / Cream Beige Dakota interior
Specs: Fully Loaded.