If by "upper strut top" he means the upper strut mount (and perhaps even the spring seat) then I would say go for it yourself. I did the strut job with a $26 jack/stand special from Advanced Auto and a 126 piece Craftsman wratchet set. And a shop light.

I wouldn't know how difficult it would be to do the steering rack, but mine was leaking over a year ago and the dealer in Syracuse quoted me at $900 to do the whole job. In the meantime, they said, just check the power steering fluid level often and refill it as necessary. I instead bought a bottle of that "Lucas" power steering sealer lubricant stuff, filled it up a few times as it worked its way in, and the fluid has been at the same level for about a year now (through 90+ degree and -10 degree weather). I consider it fixed.