Yamaha DTXpress/DTXplorer/DTXtreme

Can I think aloud for a moment? I may be coming into some money in 
the next few months and am seriously considering upgrading from my 
DTXpress I to a DTXtreme IIs module.  The reasons:

1. I'll get to use a three-zone snare and get cross-stick as well as 
rimshot for the first time on the same pad
2. A TP120SD three-zone snare pad would, I assume, be a big 
improvement on the old two-zone TP80, particularly for rim 
responsiveness.
3. I'll get to use a round, three-zone cymbal pad for the first 
time, and dispense with the bell pad that is notoriously slow-riding
4. I'll have outputs for an extra cymbal and tom plus two other 
stereo sockets
5. I can privately listen to the metronome through headphones while 
playing, and the band won't have to hear it
6. I can hit both the rim and the head together and get both sounds 
simultaneously
7. I can adjust relative pad volumes while playing by using the 
sliding switches on the brain
8. I'll have access to heaps more sounds including (hopefully!) a 
better range of cymbal sounds.
9. I can use my existing frame and most of my existing pads, thereby 
saving on the cost of a whole new setup.
10. Not to mention sampling and digital transference capabilities 
that I probably wouldn't be using in the short term.

I'm not sure on the relative costs of a new DTXtreme IIS vs. the 
DTXpress III, and I'd be interested in what others think about their 
relative merits.  The other thing I'm thinking about is the idea of 
ordering on-line.  The main drum retailer here in Adelaide, 
Australia, has quoted me $3,300 (that's $2,320 US) just for a 
DTXtreme brain!  Yet I see that Drumbalaya is offering the whole kit 
for US$2,599.  Can anyone tell me what I'd be up for in shipping 
costs to Australia if I bought on-line?