SE only ...
hmm J105 Naite @ RM 380 / RM 410 (ORI)
Stand-by Up to 600 h (2G) / Up to 583 h (3G)
Talk time Up to 13 h 45 min (2G) / Up to 4 h 30 min (3G)
Music play Up to 33 h 45 min

the longest lifetime & talk time i found among SE ><

dun seems rm250 can meet 2mp...& u wan SE Walkman series only
so w205 around ur budget but 1.3mp
W205 @ RM 220 / RM 280 (ORI)
if u wan 2mp u nid raise ur budget...
W302 @ RM 330
W395 @ RM 350 / RM 390 ; RM 410 (HELLO KITTY) (ORI)

go for w395 if u raised ur budget, as its newer model than w302 & with better life time but w302 has lighter weight...
or else juz w205...
juz plain based on paper...i dunno whether they have bad hanging problems, system problem..~

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Added on July 25, 2010, 9:01 pm
refer the standby time & talk time:
(around 1k)
aino-380(2g)/367(3g) 13(2g)/4h30m(3g)
(Lower than rm800)
Hazel-430h (2G)/450 h(3G) 10(2g)/4(3g)
elm-430h (2G)/446h(3G) 10(2g)/4(3g)
yari-450h(2g/3g) 10h(2g)/4h30m(3g)

AINO @ RM 1060 / RM 1190 (ORI)
ap rm 850 ori rm 1020[can be found this price @Clareen Gallery]

YARI @ RM 610 / RM 720 (ORI)
ELM @ RM 580 / RM 660 (ORI)
HAZEL @ RM 700 / RM 780 (ORI)

All of them got pretty decent camera,

Elm & Hazel is pretty familiar, just that hazel in slider with bigger screen & got front videocall camera, however elm in bar..
both offers GPS, 5mp camera with LED flash & autofocus, WIFI, 3G HSDPA...
Aino 3" touch screen, but limited functionality...8.1mp camera with LED flash & autofocus, support up to 32gb...3G HSDPA, GPS

if u lucky or the price just dropping, u can try get Vivaz AP @ 1k @@[HD video, GPS, 3.5mm, symbian S60 5th]
so far as i noe, nobody complains bout the system problems