I gather from your post, that you might only need a decent MacMini, iMac or MacBook Pro, current or one or two generations ago, if all you want to do is learning by doing. Those machines are still quite capable ( I edited on my G4 iBook with a 12" display once, it was hard due to the low resolution with Avid Xpress DV Free, but it got the work done with DV material) for what you wanna do, editing DV material or even material from those new HDD/Flash cameras with HD capability.
If all your footage comes from consumer or prosumer cameras, there is no need to edit uncompressed, as those cameras record compressed.
You also need fast external HDDs, Firewire 800 will suffice for that.
I personally recommend the current 17" MBP, for its 1920 x 1200 resolution and its ExpressCard slot, which gives you the ability to add additional ports if needed.
The MBP also gives you enough mobility, if that is needed too.
But a MacMini or iMac might also go.
This purchase will help you editing for the next three to five years, unless you get a good paying job and can update sooner, if necessary.
Some questions to help you (and other posters) get a clearer picture what you want and might need.
What will be the source of your footage? - DV, HDV, H264 encoded footage found on most file based consumer cameras, something else....
Do you need portability?
Do you need expandability?
What will be the final product? - video DVD, Blu-Ray, YouTube, Vimeo, other ....
How important is screen resolution for you?
That's it for now, it's quite late here.
PS: Don't take the following as an insult, but if English is your first language, you should work on your spelling, as that will come in handy for future job applications, and it also makes reading a bit hard.
Have a good evening...
and a good evening to you helpfull sir
What will be the source of your footage? - most likley what ever the standerd is for consumer cameras
Do you need portability? not especily im getting a lappy for that
Do you need expandability? it wold be help full
What will be the final product? - youtube and dvd
PS: Don't take the following as an insult, but if English is your first language, you should work on your spelling, as that will come in handy for future job applications, and it also makes reading a bit hard.
no offense or insult taken, and english is my first language. i have a bit of a disibility when it comes to writing.though for jobs and school i use spell check and spelling dictionarys all the time. i do apologize i just dont take that time just for a forum
also im editing my orginal post to make more sense