4.6 vs 4.8... Worth $7k extra?

[TerraPhantm]

Hey guys, I'm looking at picking up an x5, an have it narrowed to a 4.6 or 4.8

The 4.6 I'm looking at is interesting. It's a 2003 model, mileage is a little high (75k) but the car is in immaculate condition, and the price is certainly great too ($18k). It's got the comfort seats too which is always nice. Iirc, it recently had a cooling system overhaul and new tires.

I initially had my heart set on a 4.8, but I can't find one for less than $25k... With most of them being closer to 28k. I don't really have a problem affording that, but it's hard to justify with the 4.6 being so much cheaper.

Does anyone here have experience with both cars? Are the extras of the 4.8 (air ride, panaromic moonroof, adaptive HIDs, 6-speed, xdrive, and 10hp) worth a ~50% price increase?

Thanks in advance.