Lilydale is a good airfield... nice grass runways, close to Essenden, Moorabbin etc. Runways do get boggy when it rains though which can be a pain (especially in the Jabiru with those small tyres)
If you fly at Lilydale they will try and put you in the jabiru straight up. Be clear to them about what you want to achieve though. The Jabiru is is not VH registered, it is RAAus rego'd and as such you will be gaining your recreational pilot certificate as opposed to GFPT. They'll keep you in the jab up to the navigation endorsement, and then do a PPL conversion in the warrior. They will market it as a cheaper way to go, as the jab is cheaper, but having said that you will probably do a few more hours in the jab to get used to it as they can be a tricky thing to master if you have been flying larger aircraft already. Try and talk to some students there to see what they reckon. Personally, if you want to get into the airlines I would give the jab a miss and just fly the warrior. But as others have suggested, shop around, see what other flying schools have to offer
And yes, RAA hours can be counted towards ATPL (max of 750)