tune up question

[Kulasstar]

im putting my 34 in the shop this weekend to get a trans problem fixed.
I also wanted the sparks swapped out and so I might as well do a whole tune up, its almost there i hit 190xxx the other day.

So what type of things are supposed to be change in a proper tune up?
and how much is too much?
im looking to spend no more than $500

[632 Regal]

cap rotor wires and plugs is a good start, new injectors wouldnt hurt much either but that would def put you over the 500 mark.

shop around for costs

autohausaz.com
bmaparts.com
http://www.fiveomotorsport.com/Injector_SetsBMW.asp