Third for the NT 510 or 520. Don't get the 530 as that seems to be better for the newer Bimmers. I need to buy another 520 actually as I sold mine to get a 530... should have kept both.

If you are going to use ISTA, you can go the emulation route with one of the K/DCAN cables like most do... but I've found it much more reliable to use an ICOM. The one I bought is a clone from Ebay, but works well. Used it for ISTA D and ISTA P (though if doing programming, also use a good power supply).

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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)