QUOTE(ahpingko @ Aug 18 2010, 09:46 PM)
wa...meaning 18-55 kitlens + 55+200mm come out quality is better than 1 single 18-200mm?..

The difference in actual image quality between the kitlenses and the 18-200mm will be small. You will not be able to tell the difference unless you pixel peep but there are some differences that you might want to consider such as:
1. The kitlenses will offer you brighter apertures especially in the telephoto ranges.
2. The 18-200mm will probably focus slower than the kitlenses due to the large focal range that it provides.
3. The 18-200mm is based on an old design that is more optimized towards film.
4. The kitlenses will have newer coatings that will perform better in CA control.
There is a reason why the 18-200mm is priced at less than RM1k. If you want a newer design, try the Tamron 18-250mm which is overall better than the 18-200mm but the above point no. 1 & 2 still applies. The Sony 18-250mm is based on the Tamron design but Sony changed the gearings so the Sony lens will focus a bit faster than the Tamron.