1000 will be used a lot, so can you develop " T1000 won't be in play " cause I'm not sure to understand you point.
He means that the T1000 chips won't be in play at the end of the tournament (having been removed), so adding more T1000 chips (beyond those in the starting stacks) during color-ups is inefficient.
I also agree that 10/4/12/3 starting stacks are superior, since you won't be adding any T1000 chips to pad the initial count -- only having 7x per stack isn't quite enough since the T1000 is a workhorse chip for a large portion of the event. However, you could get by with 10/4/7/4 stacks if you used T1000 chips to color-up the T100s, or if your re-buy stacks contained some T1000 chips in addition to T5000s.
Even with spares, 1000 chips is plenty to run a three-table T30k event using a T100-base set. I'd go with the following (spares included):
325 x T100 (includes 25 spares)
125 x T500 (includes 5 spares)
250 x T1000 (includes 30x for T100 color-up and 10 spares)
225 x T5000 (includes 12x for T500 color-up, 90x for 15 re-buys, and 3 spares)
25 x T25000 (includes 10x for T1000 color-ups and 15 spares, some of which can be used to replace T5000 chips towards the end)
-----------------------
950 total chips
I'd probably round it up to 1000 chips by adding 50x bounty chips.
You won't need T100k chips.
* edited to correct early-morning brain fart regarding required number of T5k chips for re-buys