first of all. Dont waist your money with brand name computers. they arnt worth the extra money you put into them and normally are very hard to upgrade and you regret it.
The specs in the computer is very good. but if you can, cut down on the 80 G harddrive to a SCSI (at least 20G) if its only a IDE. you will be more happy with a faster haddrive then just an IDE bigger harddrive. But if you have the money to get a SCSI 80G harddrive, go for it.
I dont know much about Echo cards or any other sound cards besides the Delta 44 so i cant help yah there. But i have heard them to be very good cards.
The effects you will mostly be using is EQ, Compression, and Reverb. software reverbs are the hardest to find in software plugin form that actually sound professional. Timeworks makes a great reverb plugin, but demo things and decide what you like best. Also you need to decide what software you will be using to record. If you need alot of tracks choose Cubase, Pro Logic, Cakewalk, N-Tracks, Vegas, etc. if you only need 2 tracks for mix down purposes just get SoundForge, Acid, etc. I have been using Cakewalk for some time. Not bad but ive made up my mind to start learing Cubase because i feel it is better for what i need it for.
A mixer is recommended especially for multi track. but make sure you get a good mixer with good preamps like
a mackie 1604-VLZ Pro. But u can get along multitrack with just a preamp that has 2 channels (althought you can really do drums with 2 channels), they sometimes sound better then the mackie preamps (i think) but you are limited on channels.
The AT4033 is an awesome mic. but it cant be your only mic. Spend some money on some SM57's (very important), and if you can, buy 2 AT4033's so u can do stereo overheads on drums.
This might be a little too much for what you want to do but its basically what i recommend. Get whats needed first and work up. The more expensive products arnt always better.
Computer - $2000
6 SM57s - 600
Mackie 1604-VLZ Pro - $1000
2 AT4033s - $800
Cubase - $700
Comp, EQ, Rev Effects - $400
Of course, these prices are an estimate depending on where you buy and what you get. You could easily go down a bit depending on what you want to do. Get 3 SM57s, 1 AT4033, a lower model of the mackie 1604, not so expensive effects. It all depends on what you want to do. Im guessing too, that the computer is probably more than enough for what you are planning on doing. You could do fine with a PIII 800, 20G UDMA 7200 RPM harddrive, 256 M ram, Delta 66. With that im guessing you could get at least 48 tracks. that would bring your price down a little bit. I dont know how much money you got and what you want to do so i cant really tell yah. you could get along just fine with the minimum.
If yah have anymore questions or need more advice go ahead and ask me. Ill help yah out with whatever yah need to know.