All these new shockies and on top of it all you need to replace the most important bit - the rubber cones( I am assuming you have rubber cone as you are getting the 4 shocks)
Replaced mine and the difference in the ride was unbelieveable. Might be yet another expense but well worth it in the long run...
I have GAZ shocks(thanks Maxi) and all but one of the rears works perfectly(all are getting rebuilt next month for 50 bucks a shock). The SPAX/GAZ/Koni/KYB lines are great shocks but dont discount the Lipp brand - they are a light sports shock and budget priced($65 a shock) but look cheap(plastic upper cover)
At the end of the day, Bilsteins are over priced but downright sexy!! The old ford had 4 all round and cost me 1300 big ones. The ride was great though
Hooroo