I would wait and save up for it. A Royal Oak (Ref. 5402) is also my grail watch, and I looked into the IWC Ingenieur as well. If you just buy it, because you don't want to wait for the grail watch, you will end up wasting money and not really enjoying it.
An other Option would be to go for other designs of Genta.
@mondodec Essay about Omegas designed by Genta is a great read, I would highly recommend it.
http://omega-constellation-collectors.blogspot.com/2009/07/omega-constellation-gerald-genta.html
Maybe a Omega Constellation Ref. 14900 could be something to look into.
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