Time for a new "Budget" Gaming System, advice requested

This forum was very helpful when I built my last computer in 2009, alas having PSU and Graphics card issues with my old system so I have decided to build a new “Budget Gaming” system. Last time I choose an E8500 dual core ignoring the newly launched Ivy Bridge CPU’s this time I need to choose between Haswell and Ivy Bridge.

From everything I have read the difference between my two CPU choices (3470 vs 4430) are insignificant and pricing is the same, therefore I assume I should take the newer tech (Haswell) to give me future flexibility (if I should ever need it).

I have gone back and forth on the right GPU to pair with my CPU choice and have decided to pair it with a 650Ti Boost.

I will switch my OS from XP to Windows 7 Professional 64 bit version, I have a “retail” XP version so I could upgrade my OS (cheaper) or keep my old OS and hard drive, setup a dual boot system. I know Windows 7 has a “true” XP mode (unlike Windows 8).

I am open to any and all changes to this system within the following parameters; Intel, Nvida only and price is an issue.

First question:
Should I rely on the Win 7’s XP mode or dual boot to XP on a separate drive? I want to run XP software and even some games in a DosBox! I would say I am old school, but no school would back my claim I was ever present. 

Second question:
I am open to any brand Motherboard, I need 4+ USB ports (2x3.0 would be nice but not required price more important). ATX or ATX Micro either works.

Third question
PSU selected is well reviewed, open to less expensive option

Forth question
Is a CPU cooler needed? I assume a well ventilated case would be enough?

Fifth question
May swap out SSD for traditional drive

Proposed Build
Windows 7 Professional

Motherboard; Unknown, I need 4+USB ports, ATX or ATX Micro no preference

CPU; Intel Core i5-4430 Haswell $189.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116895

CPU Cooler; Unknown.

GPU; EVGA 02G-P4-3657-KR GeForce GTX 650 Ti BOOST 2GB $169 +$10 Rebate
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130909

PSU; XFX Core Edition PRO550W $69.99 +$10 Rebate
http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013

Case; Rosewill CHALLENGER-U3 $59.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16811147060

Memory; CORSAIR Vengeance 8GB $79.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16820233144

SSD; SanDisk Extreme II SDSSDXP-240G-G25 2.5" 240GB $189.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16820171752

DVD; ASUS 24X DVD Burner $19.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16827135204





“Old System being replaced”

Windows XP Media Center Edition 32 Bit

MB GIGABYTE GA-EP45-UD3L 775 P45 RT
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128345

CPU INTEL C2D E8500 3.16G 775 45N R
http://www.newegg.com/Product/Product.aspx?Item=N82E16819115036

VGA EVGA 896-P3-1255-AR GTX260 RT
http://www.newegg.com/Product/Product.aspx?Item=N82E16814130434

PC Power and Cooling SILENCER 750W QUAD S75CF Power Supply
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341011

CASE ANTEC THREE HUNDRED BK RT
http://www.newegg.com/Product/Product.aspx?Item=N82E16811129042

MEM 2X2G MUSHKIN 996587 R
http://www.newegg.com/Product/Product.aspx?Item=N82E16820146731

HD 640G WD WD6401AALS
http://www.newegg.com/Product/Product.aspx?Item=N82E16822136319

SAMSUNG SH-S223Q/BEBS 22X SATA DVD Burner Black Drive

CPUCOOLER ARCTIC P4 ACFZ7-PRO R


Thank you in advance for all advice.