What E70 are we talking here? Mileage?

You can rebuild the entire front suspension yourself for about $800 with quality parts, or half that with questionable parts. If paying someone, yes, I agree, could get expensive.

Edit: Just saw in the other thread you said nearing 200k miles. If the suspension is original, I'd go for all of it. We did ours in total at 150,000 miles and it made an incredible difference.

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2005 X5 4.4i Build 04/05 Maintenance/Build Log
Nav, Pano, Sport (Purchased 06/14 w/ 109,000 miles) (Sold 8/15 w/121,000 miles)

2006 X5 4.8is Build 11/05 Maintenance/Build Log
Nav, DSP, Pano, Running Boards, OEM Tow Hitch, Cold Weather Pckg (Purchased 08/15 w/ 90,500 miles)

2010 X5 35d Build 02/10
Nav, HiFi, 6 DVD, Sports Pckg, Cold Weather Pckg, HUD, CAS, Running Boards, Leather Dash, PDC, Pano (Purchased 03/17 w/ 136,120 miles)