Sager NP8690 (W860CU) 跟 Dell Studio XPS 的選擇

大家好, 小弟人在美國而最近想買一台筆電(我的第一次!!!)
預算是$2,000 USD左右,可以示情況超支
我大都是用來打電動
現在是用DELL的桌機(P4 3.2, 3G RAM, 8800GT)
我物色了幾台筆電
請幫忙比例一下
然後有幾點問題想請教一下

Dell Studio XPS 6 ($1,799)

Processor:
Intel® Core™ i7-720QM Quad Core Processor @ 1.6GHz (2.8GHz Turbo Mode, 6MB Cache)
Operating System:
Genuine Windows® 7 Home Premium, 64bit, English
Service:
2 Year Basic Service Plan
Monitor:
Full HD Widescreen 16.0 inch RGBLED LCD (1920x1080) W/2.0 MP
Memory:
8GB Shared Dual Channel DDR3 at 1333MHz
Hard Drive:
500GB 7200 RPM SATA Hard Drive
CD ROM/DVD ROM:
8X Slot Load CD/DVD Burner (Dual Layer DVD+/-R Drive)
Video Card:
ATI Mobility RADEON® HD 4670 – 1GB
Wireless:
Intel® 5300 WLAN Wireless-N (3x3) Mini Card
Battery:
85 WHr 9-cell Lithium Ion Primary Battery
Sound:
High Definition Audio 2.0 with SRS Premium Sound
Bluetooth Options:
Dell Wireless 370 Bluetooth Module (2.1+EDR)
Network Card:
Integrated 10/100 Network Card


Sager NP8690 (Built on Clevo W860CU) Custom Gaming Laptop ($1,969)
- 15.6” FHD 16:9 LED Backlit Wide screen (1920x1080) Super Clear Glare Type Screen
- Standard Dead Pixel Policy
- Intel® Core™ i7-720QM, 1.60-2.80GHz, (45nm, 6MB L3 cache)
- Arctic Silver 5 Thermal Compound
- nVidia GeForce GTX 280M 1,024MB PCI-Express GDDR3 DX10 (User Upgradeable)
- No External Graphics Card
- No Video Adapter
- ~ 4,096MB DDR3 1333MHz Dual Channel Memory (2 SODIMMS) (Requires Vista 64-Bit to utilize Full 4GB)
- Standard Finish
- ~Combo 8x8x6x4x Dual Layer DVD +/-R/RW 5x DVD-RAM 24x CD-R/RW Drive w/Softwares
- ~ 500GB 7200RPM (Serial-ATA II 300 - 16MB Cache)
- No Back Up Hard Drive
- No Floppy Drive
- Internal 7-in-1 Card Reader (MS/MS Pro/MS Duo/MS Pro Duo/SD/Mini-SD/MMC/RS)
- Internal Bluetooth + EDR
- Built-in Intel® PRO/Wireless 5300 802.11 a/g/n Wi-Fi Link
- No Network Accessory
- Built in 2.0 Megapixel Camera
- No TV Tuner
- Sound Blaster Compatible 3D Audio - Included
- Basic Black Business Case - Included
- 11.1V Smart Li-Polymer battery pack 3800mAh, 42.18Wh
- No Car Adapter
- None Standard*
- No Dock/Hub/Adapter
- Integrated Fingerprint Reader
- No External Keyboard or Mouse
- No Notebook Cooler
- ~Windows 7 Home Premium 64-Bit Installed (64&32-Bit CD Included) w/ Drivers & Utilities CD's
- No Office Software
- No Software Bundle
- 3 Year Labor* 1 Year Parts Warranty Lifetime 24/7 DOMESTIC Based Toll Free Telephone Tech Support (Labor Warranty through Xotic PC)
Includes FREE Shipping Both Ways for Warranty Repairs
- No Xotic PC Gear


問題:
1.現在用的是P4 3.2 所以想換i7, 而i7 720QM 跟 820QM 感覺上會差很多嗎?
2.DELL的8G ram很吸引我, 不過如果我用i7 那4G跟8G會有很大的差異嗎? (我有玩FM, 所以CPU跟RAM蠻吃重的)
3.DELL XPS的顯示卡是4670而CLEVO是280M, 這兩張應該差很多吧, 例如打CSS的話FPS會差多少呢? (要求流暢及中等效果而不是最高效果)
4.DELL的售後服務好像不錯, 而SAGER的評語則不怎麼樣......保固需要買三年的嗎?
5.DELL跟CLEVO的品質及耐用度那個比較好? 散熱系統哪個比較耐操? (個人用DELL的桌機是覺得蠻穩定的)


Dell Studio XPS 6 ($1,799)
Sager NP8690 (Built on Clevo W860CU)($1,969)
以上兩台是我找到的
一開始是想買藍天的, 因為有i7而且顯示卡不錯
然後就想等到聖誕節才買
現在就看到DELL因為聖誕節所以在打折
然後DELL XPS也剛出了i7,ram加到8G也蠻便宜的
所以就不知道應該怎麼辦了
各人是看上CLEVO.....可是我連CLEVO的實體看也沒看過所以會擔心
而網上的評論也都不一致
請各位幫一下, 謝謝