Questions on my 1645 Configuration

I've ordered a new SXPS 1645, as below, but I'm not sure about a couple of items in my configuration, and opinions would be great before the laptop is built and shipped:
1) Dell Wireless-N Card 1501. Is it any good? It was the default card, and could have paid $30 extra for an Intel 6200, but my Dell rep said it wouldn't be any different.
2) 8GB DDR3-1333 vs 4GB DDR3-1333. Will I notice the difference? I do web browsing, some 3rd person shooter gaiming, and a bit of photo & video editing. Will the extra 4GB make a difference?
3) I selected default 1 year warranty, but I can extend it to 3 years, including accidental drops and spills, for about $330. Is it worth it?

Here is my config:
Item Number Item Description Quantity

224-7375 Studio XPS 16 Notebook 1 $1,551.75
312-0950 9-cell Battery 1
313-7056 BLURAY COMBO,INSP 1
313-8545 HD AUDIO 2.0 with SRS 1
317-2361 i7 720QM 1.6GHz (2.8 GHz, 6MB Cache) 1
317-2366 8GB,DDR3,1333MHZ,2 DIMM 1
320-1307 ATI Mobility Radeon HD 5730 - 1GB 1
320-8330 15.6 1080P FULL HD WLED LCD, W/2.0 MP,IN 1
320-8351 Obsidian Black High Gloss Finish 1
330-6222 Windows 7 OS Label,CNB 1
330-7785 RESOURCE DVD,BACK-UP,MDSN,XPS 1645 1
341-8989 500GB HARD DRIVE,7200RPM,M1640 1
410-1883 ADOBE READER 9.0,MLANG,I/S/X NB 1
410-2466 MCAFEE PEARL MUI,15MTH,W/O,XNB 1
412-0148 NO ISP REQUESTED 1
420-6436 PC-RESTORE, DIM/INSP 1
420-6576 DELL WELCOME,SW,DIM/INSP 1
420-7938 DELL CONNECT 2.1,DIM/INSP/XPS 1
420-9100 DELL DOCK CONSUMER,INB/XNB 1
420-9352 DELL,SW,WILD TANGENT INC GAMES I/S 1
420-9691 DATASAFE LOCAL BACKUP 2.0 BASIC 1
421-0092 DELL-DOWNLOAD-FLAG 1
421-0187 DELL SPRT-CTR SW,64BIT,2.0 1
421-0188 FACIAL RECOGNITION 1
421-0323 WINDOWS LIVE SEARCH,MUI,CSMR NB/DT 1
421-0757 SKYPE VOIP SOFTWARE APPLICATION,CNB 1
421-1010 Dell Webcam Central v1.4 1
421-1361 MOD,SW,RXO,EZCD,10.3,DE,FI 1
421-1583 CYBERLINK POWERDVD 8.3 BD-P DVD,CNB 1
421-1737 WIN 7 HOME PREM, 64, ENG,S/XNB 1
421-2086 EBAY-WEBSLICE, CNB 1
430-0763 Dell Wireless 1501 for Canada and Latin 1
430-3605 INTEGRATED NIC 1
420-8051 MS WORKS 9.0,ENGLISH,INSP 1
905-5707 HW WRTY+SVC,STUDIOXPS 1645,SOL,INIT,CA 1
906-5460 RTD,STUDIOXPS 1645,SOL,INIT,CA 1
920-5070 XPS WARRANTY SPRT, INSPIRON, INIT YR,CA 1
009-5850 ** THIS IS A NORTEL NETWORKS ORDER ** 1
950-9057 NO WARRANTY,YRS 2/3(1-1-1RTD) 1
600-0043 ON $2.75 ADS, NOTEBOOK PCS 1
Subtotal: $1,551.75
Shipping and Handling: $0.00

Environmental Disposal Fee: $3.00
GST/HST: $77.59
PST: $124.14
Total Price w/Discounts: $1,753.48

 

4GB of memory will be enough for regular usage and gaming. as for your network card, N is better than G

 

IMHO, if you are going to spend 2K on a computer, might as well spend the few hundred to insure it....... And with a machine that runs longer it is bound to die out faster....