In relation to the HHonors offer; do you get a discount as an elite member and/or do Hilton have any of their less expensive brands in Aust?
Unfortunately most of my travel is domestic at present and the budget doesn't stretch to the Sydney Hilton rates.
No and no on both questions.
With Hiltons in Australia/New Zealand, the biggest culprits in my (limited) experience for being "expensive" on any given day are Sydney (because it's Sydney), Brisbane (not many other greater competitors of the same calibre around, and definitely on most corporate travel's "official" lists), Melbourne on the Park and Auckland.
Hiltons aren't necessarily overly expensive, but you do need to keep a watch out for sales. It's not unusual to grab advance purchase rooms on sale for less than $200 per night (Hilton often has such a big sale near the beginning of the calendar year). Sure, they will still be more expensive than Holiday Inn or even Crowne Plaza when those brands go on sale, but it's still not as expensive as you think. (Though of course it may just put your accommodation budget a notch up).
Consider the Diamond benefits mostly outweigh those of PC Platinum benefits. For example, Diamond will give you upgrades on your room to an Executive Room (if the hotel has Executive Rooms and one is available for you) as well as access to the Executive Lounge (again, if the hotel has one). If you don't get upgraded to an Executive Room, you should be afforded some sort of upgrade at least. You are guaranteed complimentary continental breakfast every day of your stay, as well as free high speed internet. And of course, Hilton has "double dipping", so you can earn both Hilton HHonors points and airline miles at the same time.
The only "cons" to keep in mind relate to status and burning points:
- Hilton HHonors redemptions are generally much more expensive; in the industry, possibly one of the most expensive in value. Redemption depends on the category of a hotel rather than its brand, where the category is a number from 1 to 7. The higher the "class", the more expensive the redemption cost per night. Most Australian Hiltons are "high category" hotels. For example, the Hilton Sydney is a category 7 hotel, the highest one, with a minimum redemption rate of 50,000 points per night. Compare this with a Holiday Inn which at worst will cost 25,000 points per night (though comparing a stay at both hotels is chalk and cheese); same rate as Crowne Plaza. Even Intercontinental will set you back only 40,000 per night at worst.
- Retaining Hilton Diamond is very difficult. Even retaining Hilton Gold is quite difficult and PC Platinum makes only a scratch in comparison. Hilton Diamond requires 28 stays, 60 nights or 100k base points; Gold requires 16 stays, 32 nights or 50k base points. PC Platinum requires 50 nights or 60k points. Hilton HHonors only counts base points for elite status qualification - bonus points do not count. (The ease of getting PC Platinum ironically makes it one of the lesser exclusive top tier elite levels in the world, and the "benefits" somewhat are reflective of that).
If you would like to consider another credit card, the Hilton-Macquarie card gives you a 20% discount on any rate at Hiltons in Australia, New Zealand and Fiji. You don't need to pay with the said credit card to be eligible to use the discount benefit it offers. There are also a couple of other small perks that go with the card. The annual fee for the credit card is about $300.
Hopefully that should give you enough to make a decision.