I recommend against Dell and Gateway. I personally use HP, Asus makes good machines, not Acer, Sony, Samsung, and several others make decent machines...I personally dont care for toshiba. some people swear by them.
Every company has their good and bad models...in my case, the XPS was a great model I bought 3 or 4 years ago...as a refurb. Hard telling exactly how old my machine is, but it still rocking away.
My old toshiba gave up after two years and a motherboard later.