Hi all – I would like to get some opinions and advice on my plan as per below, I can spend up to £2000

Current equipment:
Acoustic / Electric guitars / bass with amps
Condenser microphone, stand, pop screen etc
Fostex MR8mk2 (digital multitraker - to sell)
Decent headphones
Some vocal prowess (!)

Needed equipment:
Upgrading to computer recording, so PC v Mac, flat screen LCD (one or two?)
I LOVE pro-tools (anything as easy to use and with such editing capabilities?)
Mixing desk / interface (I like having the sliders) and want to record up to 4 tracks simultaneously, layering to perhaps 10 / 16
Monitors (‘active’ or not?)
Desk (could build one)
Midi controller keyboard (to be used for piano parts, piano sounds, basic organ / electronic keyboard sounds etc, so probably 3 octaves at least)
Software that will give me great reverbs / delays etc plus something to help me master
Also – something with electronic drum loops on it to add if the moment suits, more chilled electronica (Talk / Talk, The Blue Nile etc)

So I guess I am looking for advice on how to split my budget on the above and specific advice on products (old faves and new ones!). This is for a bedroom set up, and I want to be able to produce works of near-commercial quality, all my instruments are great. My initial research has led me to things like the packaged Carillion Ac1 at £799 for the computer, but I am sceptical that this will produce the quality I am after. Thoughts all welcomed, thanks very much!