You can get the cost from many of the shops in Sofitel Area.Try to get a bargain.
Cat5 or Cat5e, not much difference if you are using within a room, but it will matter if the distance is considerably longer and the path in nosier.
Technically Cat5e can give you Gigabit transfer speeds, as it has more noise immunity and low level of noise crosstalk compared to Cat5.
However nowadays all the cables available in market is Cat5e or Cat6.