Looking for advice on this Mini-Itx Build.

In general you are on the right track, there's only one serious problem and a few trivial ones.

The "big" issue is that you can't fit an optical drive and a H100i in a Prodigy without modding, as in the top or front positions a 240mm radiator blocks the ODD.
The best way to solve this is just to use an air cooler instead. The Z97I-Plus has great compatibility with air coolers, as does the Prodigy case. You'll get better value for money here too, and likely better noise characteristics too.
If you want to keep everything you have, then the easiest solution is to switch to a Corsair 250D. It's more or less designed with this type of build in mind (H100i+optical drive) and nothing at ITX level is quite as suited.

Onto the trivial stuff -
PSU isn't very good. It's very short which is helpful, but otherwise it's not a great pick. I'd generally avoid Corsair PSUs right now as they are either average, overpriced, or both. You don't explicitly need a modular PSU in a Prodigy either, it's a nice thing to have but there's a decent amount of space to tuck cables.
I'd suggest looking at the Antec HCG-520M/620M as well as more or less anything from Seasonic/XFX.

Fans If you stick with a Prodigy you'll likely want to upgrade the fans. The stock ones are ok if you want something quiet, but they don't move a lot of air. Stick a decent 120/140mm at the back and a decent 140/200/230mm on the front and you have very good airflow (two case fans is enough).

Budget balance. If this is a machine exclusively focused on gaming, then it's highly likely that you want to go deeper into graphics as a percentage of your budget. As a general rule of thumb, the higher this percentage is - the better a gaming machine it is. You don't list any details about your display resolution - this is fairly significant (see "asking for build advice" sticky) as it's going to skew how much it makes sense to spend on graphics.
At sub 1080P, you've probably already spent enough (arguably overspent) by going for a GTX760.
At 1080P you have a solid card, but it's lifespan isn't going to be phenominal if you want to play AAA games at high/max settings.
At 1440P or beyond it would definitely make sense to push more funds towards graphics.
(This is a very rough guide)

There's actually a very easy way to do this - drop overclocking.
It might seem counter-intuitive, but most games are still predominantly graphics bound and a stock clocked i5 is going to keep up remarkably well. It's a little hard for me to estimate in AUD, but you could save anything up to around $300 simply by dropping this facility (and the accompanying motherboard+cooler) which could give you enough budget flexibility to grab a GTX780, R9 290 or R9 290X - definitely worth thinking about.