well, if want to use both, then MacBook Pro.
its not necessarily needs 2.53ghz to be not hang, no need to be fixated on 2.53ghz.
as for other brands, not much emphasis on 13'' segment.
the upcoming Vaio S with intel core i3 / i5, should be starting at rm 4k.
or Asus UL30Vt which runs on low voltage processor, 1.3ghz, with nvidia g210m, better graphic card than the macbook pro 13''and can last 6++ hours, rm 3k
toshiba m900, intel core i3, nvidia g310m, rm 3.2k
compaq cq36, core i5 430 2.24ghz, ati hd4550, rm 2.6k
p/s if you want to take the macbook pro, you might want to wait for a while, since refresh of macbook line should be near.
i scare i can't wait it because i am going to aus end of this feb.