E-Machines = NEC/Packard Bell...
Good for plinking targets, not much else...
Ditto for HiPaq (HP) & Gateway... The only 'half-decent' (and barely) 'National Brand' is a Dell...
What do I reccommend?
Go to the largest of your local PC shops, and buy from them...
Be wary of anything with a warranty over 1 year: if it's got a long warranty chances are you'll need it (one shop in our area is famous for their 5yr warranty... BECAUSE IT'S THE ONLY THING KEEPING THEM IN BUSINESS)...
The advantages of a locally-built PC are many: local warranty service is available (as opposed to getting to know your FedEx guy on a 1st name basis (Dell), or taking it to CompUSA or RadioShack so they can FedEx it for you!!!), and prices are comparable, plus you can actually talk to the people who build/service what you're gonna buy... Also, local shops have a tendancy to use GOOD PARTS, rather than assemble your box from 2-year-old NOS (New Old Stock) parts, toss in the fastest CPU it can handle, and slap a 'bargain' price on it... These machines are generally ACTUALLY FIXABLE (a/o 100% integrated, if-it-breaks-you're-screwed), and are made from [b]standard parts, so anyone can fix them[/b], a/o the proprietary crap found in most major-brand machines...
Bare minimum for a 'good' PC is $700 monitor-sold-separately. $800-900 is much better... Anything less than that is a 'clearance special' (weather advertised as such or not), and you will be buying a fast CPU plugged into a box made from all the crap they couldn't sell LAST Christmas....
If you're monitor shopping, don't waste the bucks on a flat-panel UNLESS you need the space. There is NO VISIBLE DIFFERENCE apart from the footprint on your desk...
CPU wise, P4s are faster right now in absolute terms (i.e. 'Money is no object, build the fastest PC I can buy'), but the price difference means you'll probably be able to afford a faster system at any given price point if you go AMD. However, VIA and SIS make *TERRIBLE* chipsets, so if you go AMD make sure your motherboard has a nVidia (aka nForce2) chipset. If you go Intel, [b]INSIST[/b] on an Intel motherboard (865PERL) to match your Intel CPU... We're assuming here that my earlier advice has been taken and you're buying from a storefront shop...
Remember: CPU, Memory, Video Card is the 'trinity' of PC design. If you get a P4 3.4ghz with DDR-200 memory and 'Intel Extreme' or 'SiS' motherboard integrated video, you'll have a system that runs like it's a 1.4ghz (no joke).
Second, if you can't build it yourself, buy local. Clone builders are a dime-a-dozen, but they all build the same stuff... This leads to better boxes, and interchangable parts, the only thing you won't see (most of the time) is the annual Christmas-season 'Clear the Warehouse' special featuring a bargen price on the latest, greatest CPU (in a system composed of 'leftover' parts)...