I would recommend
Sony VGN-FW Series
(e.g. SONY VGN-FW140E/W or SONY VAIO VGN-FW270J/H)
+ Very stylish
+ The Sony VGN-FW laptops all have good sound-quality for your music.
+ Great display (your photos will look crispy), also really big (16.4" !!!)
+ Bluray (definitely investment for the future)
+ Really good keyboard
+ All models will be good enough for playing games like SIMS 3.
Price: (bad news) it will cost you at least 900$ to get a new model
Alternative:
HP Pavilion DV5 Series
(e.g. HP Pavilion dv5-1250us)
+ The Sound Quality is also good.
+ The Display is good (although not as good as the VGN-FW & smaller display 15.4")
- No Bluray (only DVD)
+ Keyboard is good
+ Also all models should be able to play SIMS 3.
Price: 700$ absolutely in your budget! (shopping.hp.com)
My Advice: the extra 100$ for the Sony are well invested, but if your limit is exactly 800 the HP is a good laptop!