based on my personal experience you should be alright for a while, maybe even for the expected life of the strut. i was lowered on progress springs 1.75 for two and a half years with old struts and now have been lowered 3.5" for a month or so. the worst that could happen...the strut blows and the cars weight drops on the spring. if your car is low enough the body of the car might hit the ground, but youd have to have a really soft spring and a really low kit for that to happen. you can do the coils now and struts in a couple of months if you want. are you under warranty? if so do the coilovers yourself so that if your struts go you can put the stock ones back on and get new struts from satan (if they are covered)
http://www.geocities.com/blue2gnt

1995 Eclipse GS - HRC Stage 2 - Retired.
2004 350z Enthusiast / 2008 Nissan Versa SL