After lot of search on internet & electronics market. I found that creative muvo T200 is the best in terms of sonund/accessbility/power backup.
I am using this device from last more then 2yrs with use of almost 1hour a day.
& still its working as brand new device.
The best things are:
1)- Long power backup.
2)- Easy use.
3)- Good sound recording
4)- 3.5mm jack - can connect almost all speakers.
Worst thing:
1)- Poor FM connectivity
- if you will go in some far place the the FM quality degrades as compared to othe rdevice on same location.
2)- No bluetooth
- if you want to take some good song from some othe rmp3 player or mobile phone. You need to connect both device on PC for data sharing.
After all the device is nice & can be purchased.