I have a 2000 X and just had my 60k, I was advised not to bother using Lexus cos of the age/value of the car, given that the 60k is a major one and expensive labour (lexus edited their service details for the timing belt, saying 6 years/60k, contrary to the books saying 100k), unless you know someone at lexus who can do it on the cheap,
timing belt/tensioners/aux belts/water pump should all be checked at 60k, the water pump alone from lexus is £100+vat, the labour for the belts/pump etc is 3-4 hours, so obviously its best to get them all done together if you can, I luckily didn't need a water pump so I saved £117,
if they've already been done then your laffin'
check other threads on here about plugs
I might add that creativeperformance2004 has been recommended for them, however, I ordered 6x IK20's and 6x IK22's for Jamie's and only received 5 of each, and am currently in dispute about the 2 missing ones, lol, I don't know how often this seller cocks up...
hope this all helps