For your sister's laptop go for
Acer Aspire 5542G. It is a very good laptop for the work u have mentioned and also having a good graphics card for casual gaming . The Gfx card will also help in different softwares u have mentioned.
Here goes it config
Price is 36.5k (check gadgetguru website)
- Turion-II Dual Core M500 (2.2 Ghz,1 MB L2)
- ATI Mobility Radeon 512MB 4570 HD GDDR3
- AMD M880G Chipset
- 3 GB DDR2 RAM upgradable up to 8 GB
- 15.6" HD-LED(Max Res 1366X768)
- DVD Writer,
- 320 GB HDD
- -BT, MultiCR
- FPR, Gigabit LAN
- WebCam, 4 x USB Ports,
- Dolby Stereo Speakers
- HDMI, 6 Cell,Linux, 1Yr,CC
For your gaming go for HP Pavilion DV6-2005AX (Rs44000) (AMD Turon II based)
Price is around Rs 44k (check priceindia website)
Config
* Genuine Windows 7 Home Premium
* 15.6″ inch (1366×768 Pixels) HD LCD Display
* AMD Turion II M500 Processor (2.2 GHz, 1MB L2 Cache)
* ATI Mobility Radeon HD 4650 1GB GDDR3 Dedicated Graphics card
* 4GB RAM DDR2 800 MHz
* 320Gb Hard Disk
* DVD Writer
* Intel 802.11 a/b/g/n Wi-Fi
* Bluetooth 2.0
* WebCam with Integrated Microphone
* Altec Lansing Stereo Speakers
* 5-in-1 integrated Digital Media Reader
* Fingerprint Reader
* 4 USB 2.0 ports, VGA, stereo microphone in, stereo headphone/line out, HDMI, power connector, RJ-45, RJ-11
* 6-cell Lithium-Ion (Li-Ion) battery
* Weight – 2.59 kg
Both the laptop I have suggested is based on AMD Turon II processors. Now I know that a lot of people have allergy with AMD processors.
But the new Turon II series processors are much more efficient in power consumption as they are based on 45 nm fabrication process. Their performance is better than C2D600, the Core2Duo processor available within 50k range in India.
For your laptop ATI mobility radeon 4650 with 1 GB GDDR3 memory is gr8. Its performance is on the per with Nvidia GTS 250M, plus u get Dx10.1