Dimmer Switch Advice

Changing almost all of the switches and sockets to these http://tinyurl.com/pwo7 , but need to know if the following is possible.
Replace the 1G2W Switches in lounge and 2 bedrooms with these 1G2W Dimmers for 100W Halogen Lights. http://www.tlc-direct.co.uk/Products/KND12BC.html
In the hallway there will be 2 x 60W Halogen Lights. These can currently be switched on/off by 1G2W Switch at one end of the hallway and by the right 2G2W Switch. The left operates the kitchen lights.
Want I want to do is replace the 2G2W with two of these. http://www.tlc-direct.co.uk/Products/KND22BC.html
The 1st left dimmer for the kitchen lights 240W spot lights and the right for the under/inside the wall units. 4 of these (2 x 20W) http://www.tlc-direct.co.uk/Products/QLHC2W.html
The 2nd left dimmer to control an outside light which will be 150W and the right for the 2 hallway lights (2 x 60W).
I don't think the 4 Gang Dimmer Switch will be OK for this. http://www.tlc-direct.co.uk/Products/KND25BC.html
I will probably replace the shower switch 45a with this. http://www.tlc-direct.co.uk/Products/KN82NBCW.html
I would like to replace the fan extracter switch which looks something like this http://www.tlc-direct.co.uk/Products/MKK4857.html to this if it's OK. http://www.tlc-direct.co.uk/Products/KN8NBCW.html
Any advise will be appreciated.
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