two 10w3 subs and either a 250/1 or 500/1 class D mono block amp. That will be more than $550. To cut the price down a bit you can get the 10w0's They are about $125 each vs $250 each of the 10w3. With the 10w0's you can get away with a 250/1 monoblock. These are obviously all JL Audio's. Also, don't mix the subs. I prefer 10's due to the faster response vs. a 12. Besides, two 12's are WAY overkill for the cabin of a Z.
P.S. - Sorry about twisting your arm and FORCING you to get them. =) That was very inconsiderate of me.