DAW Latency?

I am in the process of building a audio only recording computer.My question is in regards to latency.From what I have read on the issue there will be a bit of latency on pretty much any digital setup I choose if it's hardware like a VS or DPS recorder or PC/Mac based like Protools, Nuendo etc...I would like to know how this will effect recording live overdubs.I have used pretty much all of the stuff I mentioned above but I have never tryed to do live overdubs.In the past it was just tracking the beats in to the recording medium from my MPC and recording my DJ set's.Now I want to be able to record my DJ mixes one track at a time onto my computer and then come over the top(on a seperate track) with another song in perfect time and tempo.Back in the day we used to use this same method on a four-track Fostex with great results.Now I would like to try it on a computer because of the longer recording time(The old Fostex can only do 15 minutes at a time)and of course the editing and plug-in effects that are available.It should work in theory but I don't want to have to sit there and pull all the tracks back into time once they are recorded.If you have any insight please help a brotha out...

im no expert but as far as i know, yeah, there will always be some latency but you can still get down with it just fine (people do it all the time). as far as i know the important thing is to have a soundcard that has or supports good drivers. ASIO is apparently the best and can get your latency down approaching the mathematical limit...my setup is far from that and i have mad latency but i can still get things to work - i just try not to complain and get it done anyway. next thing on my list is an asio soundcard though, now that ive cobbled together a working desktop....

but yeah its not so bad. i feel like i just kinda compensate for it automatically. ....

I keep finding these numbers on latency like 1.5. to 6 miliseconds is not noticeable to the human hear but I am wondering how that relates to beats.I know when beat matching and blending two songs together that pretty much as long as you keep the beats within 1/16 of a beat that you can't tell that they are off unless you are using identical songs and then you get that phasing effect.At any rate I am starting my PC this weekend sometime so hopefully everything works out fine.

Latency is not really an issue anymore with most newer soundcards.
You can "feel" something like 10/12 ms. a litlle bit when making drumpatterns, but you can even get used to that.
A new pc with a decent soundcard should easily go as low as 3 ms. and that's just impossible to hear.
My soundcard goes as low as 1.5 ms. but i leave it at 3 to 5 ms. most of the time.

Cool I am ready to get back into the computer side of things as for a while I'd left them alone to concentrate more on other aspects of my productions.I've been a Pro-Tools LE user in the past but now I am switching over to Nuendo.Does anyone have any experience with the UAD plug-in cards?

As far as soundcards, go for firewire and PCI cards over USB for better latency. You'll also have to play with the latency settings on your card and Nuendo to get the best possible setting.