Purchasing?

So. Today is the last day of a deal by newegg.com. If you qualify for a Preferred Account you can get payments for 12 months with no interest. I want to say this is an annual deal, possibly to get through the buying slump that usually proceeds the Christmas holiday, possibly also, to encourage the buying of products that will soon be replaced by newer and possibly better versions, just don't quote me on that. So here is my dilemma. Do I wait, like a responsible person, to pay for everything with cash instead of adding another payment to my list of monthly bills even if it is a small list? Or, do I dive in head first, knowing full well that I'll pay it all off well before the 12 month dead line, thus not loosing any momentum on the build, and more quickly being able to get to play the games I've been itching for for months? 

As of right now here are my decisions, at least the ones I'll be getting from new egg.

COOLER MASTER HAF X RC-942-KKN1 Black Steel/ Plastic ATX Full Tower Computer Case

ASRock P67 PRO3 (B3) LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
  
HIS H467QR1GH Radeon HD 4670 1GB 128-bit DDR3 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card

 Western Digital Caviar Green WD10EARS 1TB 5400 RPM SATA 3.0Gb/s 3.5" Internal Hard Drive -Bare Drive

 Intel Core i5-2500 Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor BX80623I52500

CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C9

ENERMAX PRO82+ II EPR525AWT_II 525W ATX12V v2.3 80 PLUS BRONZE Certified Active PFC Power Supply

I also have Windows 7 Pro in my 'shopping cart' but I think I'll see what I can get at Best Buy or Office Depto, maybe I'll be able to pick it up for a few dollars cheaper, even if it's just not paying for shipping and handling. I'm also getting my monitor from a store, looking online wont compare to seeing size and color in person. Other things I'll pick up in the store will be mouse, keyboard, speakers, and a CD/DVD drive. Not sure if I want to go all out right away and get something rewritable with lightscribe or save myself the dough because, one, it wont be my initial use for my build, and two, it will give me something to do after I've acquired some experience. 


I'm expecting issues. Whether it be items damaged on arrival. Not enough plugs. A lack of compatibility. System errors or the such but this build is for more then having a gaming computer it's the experience of building it, fixing it, maintaining it. 


I'll be back once I've made my decision. Then it's on to the joys of putting it all together.