Bro, not likely you can get anything extremely good with RM250 for a 5.1 speakers. Either you wait and save more for 5.1 or go for a 2.1

Edifier M3300 is a good buy ar RM230 +. 

2421 not that nice for music listen ,the voice come out from it was little bit blur , it is lower price than M3300 , but if u want the best sound quality at below RM250 , no doubt M3300 is the best choice. Many agree about this 

Few things to answer yourself first, before jumbling yourself with products choices
1. Will you mainly be using it for music, games, or movies?
    (2.1 or 5.1)

2. What kind of music you listen to most of the time?
    (Will nail down your preference for more emphasis on bass, midrange or treble reproduction). Opera lovers will buy very different models than rock music lovers.

3. Budget?
    (which products realistically that is in your price range)
 
4. Test those 4 - 5 products with your own ears. Buy the one you like most.
Personally, I don't think much of Sonic Gear products, for now. But you don't get much quality choices in RM150 bracket...