HD Hardware Set Up query

I've been dragged kicking and screaming into the world of HD video editing after years of working happily with DV Pal.
I'm on a hugely steep learning curve as far as codecs and working with the right hardware set up is concerned and would really appreciate a bit of help so I can get on with the creative side of editing.
I currently have an old G5 and a Macbook Pro. The Macbook Pro is what I'm using to edit to (advanced rough cut stage) my new project on (a 75 minute low budget doco destined for cinema release) - but it's clear to me my current hardware can't cope. The Macbook pro is a couple of years old (silver not black keyboard) - 2.4GHz Intel Core 2 Duo with about 15GB free on the hard drive. I've upgraded the RAM to 4GB and have the footage which is a mixture of ProRes 422 (Proxy) HDV, AVCHD and XF300 native on 2 Lacie 800 1TB drives connected via firewire. I've ordered a SATA card so I can link those drives via cables to the Macbook Pro. My suspicion is these drives aren't fast enough - so that's my first question. At present I get a realtime delay when skipping quickly through footage - stuttery playback.
I'm willing to invest up to £4,000 in new hardware for this project which I would really like to include a screen. I'm considering a new top of the range iMac but don't want to compromise for the future. If I go down the iMac route - how can a get lightening fast drives to work with it - and how should they be connected? Obviously for my budget, a Mac Pro is going to be pushing it.
I'm utterly confused by what I've read about RAIDs - I just cannot find a clear explanation of how these work - how I should set it up etc. At present I've only got one back up of my XF300 cards on a 1TB drive and feel really vulnerable without good old tapes - so feel a mirrored drive might be a good way to go - but then worry that it will slow my system down.
Basically, I just want to be able to edit in the way I did with DVPal without the constant worry of losing footage and my system not being able to cope. If it means upping my budget (by another £1000 or so - then so be it).
I know these kind of questions are annoying as there's been to be the answers out there somewhere - but I'm really up against it and so any help would be much appreciated.
Cheers for now,
Ant

the footage which is a mixture of ProRes 422 (Proxy) HDV, AVCHD and XF300
Well for starters, what are your sequence settings? ProRes Proxy, HDV, what? Also, you can't work with AVCHD natively, so what did you convert it to? ProRes?
My suspicion is these drives aren't fast enough
FW800 shouldn't be too much of a drag for straight cutting with those codecs, unless you're piling on filters etc. eSATA will be a boost, certainly, but I don't see that the drives are the real problem (unless they're 5400rpm rather than 7200+).
The iMac vs. Mac Pro question is thought out pretty well here:
http://provideocoalition.com/index.php/mcurtis/story/newquad_cores_imac_or_macpro/
Those are the questions you need to answer-- mostly the one on expandability, as that's the big difference between the two in the end. If it's important to you, but you can't afford the new models, you might consider a used Mac Pro over a new iMac.
Best to just do some Googling on RAIDs and research from there. The bottom line is that they offer either a) data redundancy (protection) with the same speed, or b) increased speed with no redundancy. Or both redundancy and speed, but then things start getting expensive.

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Filter
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FYI
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I am not using "Master Data" for the "Access Type for Result Vales" for the additional characteristic "MILESTONE" just "Posted Values".
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Stevo

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