Yeh i was going to go for the NTAG203 but then i used trigger and created some dummy actions that i would use, they were well over the 144bytes mark. The Topaz 512's arent that much more expensive, only a couple of dollars. I dont mind paying for quality.
Yeh I just ended up buying them, figured I might need the extra memory. From the site below for people in Australia (I contacted them and they confirmed there is complete overlap b/w this and the NTAG203 besides the memory) :
https://www.whiztags.com/product/whiztags-10-pack-topaz-512-compatible-with-all-nfc-phones/