Wow. This is a great subject. Something I know a lot about, so hold on I might bore you.
I used to work in a music store in Australia and I have also played Nothing but birch drums for 15 years. In my shop we were both a Tama and Gretsch dealer. Prices of drumsets are similar in dollars to Singapore but are a little cheaper here.
Both of the drums you mentioned are great sounding drums. It is true that Maple drums are "dark and warm" but I have found that birch has more attack and focus but also projects its sound a lot further, being louder. Personally regardless of the price, I prefer Birch.(remember sound is a personal thing neither is better or worse)
Tama Starclassic drums are AWESOME. Die cast hoops, great colours, brilliant hardware etc, etc. Made in Japan and sound great. Try out a 22 x 18 kick drum and tell me it is not one of the best sounding kicks you've heard. (sorry I'm now dribbling from the side of my mouth, haha)
The Gretsch Catalina Birch kit is fantastic. Very cool classic look, Great sound, good hardware (Gibraltar). Made in China, BUT still great quality. And about half the price of the Tama.
Tama have just released the Superstar which I currently own which is made in China but has close to All the features of the Starclassic, eg: Birch shells (outer ply is Basswood, for looks), die cast hoops, star cast mounts and they look, feel and sound great. And half the price of a Starclassic.
If you have any more questions, just ask. I'm happy to help a fellow drummer.