B3 TS360A (1" compression Driver/ 15" woofer) = P19,800
B3 U15A (1" compression Driver/ 15" woofer) = 20,800
B3 Sigma 215A (2" compression Driver/ 15" woofer) = 28,800
consider your expansion plans. if you think that eventually you will need to buy another pair of speakers, go for the TS-360A so that if you eventually serve a bigger area, you can easily array them. The U15A has a wave-guide horn and may cause lobing (phase cancellation) if arrayed.
on a different note, you can justify (in your mind) the 8K difference by:
1) the difference of the 1" to the 2" compression driver is P4,000
2) the cost of the Plastic enclosure vs. the wooden enclosure with the flying hardware accessories is about P4,000 as well.
Hope this helps in your decision.
The Music Source
2nd Floor, Ali Mall