scour coupon sites like
slickdeals.net or other coupon sites
(or i can pm you if you'd like,if i remember)
for when dell has coupon codes for their dell out
usually it's 15-20% off most of the time it's a code for everyone, sometimes it'll be a one time use only email code.
something like this(this will probably be gone but you get an idea of what dell can give you for 430ish bucks)
http://outlet.us.dell.com/ARBOnlineSales/Online/SecondaryInventorySearch.aspx?rn=4670&SC=&c=us&cs=22&l=en&s=dfhSee the thing about a prebuilt system like many have said is the tech support and issues, i'm known as the tech/geek guy for family/friends. For the first few years i was like yea cool, lemme come over and yada yada... then it got old. So i just say dell, if you break it down component wise it's probably a 10% net over what you can get from building yourself at newegg(don't forget dell ships free too).
if not that and you want coupons try e-junkie.com
i've never used them for dell coupons, but i have used them at least 3x to get unique/one time use staples coupons. I mean these staples coupons are like 2/3bucks and it's 25 off 75, so you basically get 22$ off really (and they email you the code right away).
here's one coupon now
http://www.e-junkie.com/shop/product/437595.phpbut i highly recommend a dell/hp (whatever) builds it for her, tech supporting for free gets old after the first 10 years.