Wow you have of choice in there and all great spots!!
If you have a month I would suggest South East Asia as you can easily fit a lot of travel in and also some beach time.
So if you travelled around Vietnam, Laos & Cambodia, you would be able to do this easily in a 3 week timeframe. Then that gives you a week left at the end to do your beach break, you could head to Thailand for this to keep costs down or if you leave Vietnam as your last country to see you could do a beach break here.
You could also combine Abu Dhabi or Dubai into this at the start or end of your trip so that is another country off the bucket list!!
The only thing you do need to consider with South East Asia is that September is rainy season. So unfortunately you need to expect some rain along the way with this itinerary. That doesn't put people off though, probably as Irish people live in a wet climate most of the year anyway, people do still travel then.
I visited Vietnam and Cambodia in September and everyone said I was mad to do it but honestly we only got about 3 days where it rained during a 3 week holiday and that was only for about 10 - 15 minutes on each of these days.
So I was very lucky but have had friends saying the same thing that it was never days of constant rain, however you just never know!!
Another option you might consider is Borneo. This is easily combined with pretty much any country in Asia and even Dubai or Abu Dhabi. August and September are really good months weather wise and it is just beautiful over there. Although it will be rainy season in Malaysia you could stop for a few days in Kuala Lumpur on the way over if you fancy a quick city break.
So there are lots of choices depending on your budget, but generally Asia is pretty affordable.
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