If you go Ares there are two models and 3 colours for each. The original (more expensive) model comes with a short barrel and a MARS sight (it's actually a CTAR). The newer model that replaced it has a rail instead of a sight and the normal length barrel. The colours are black, green, and Dark Earth. (checking the Ares website they still do a CTAR without the MARS sight, but I've not seen one for sale over here).
As it's an older model you'll probably find end of stock being sold off - I got mine reduced from ~£380 to ~£280 (from memory).
Note one option is to keep an eye open for second hand where the owner has given details of any fixes he has done (or had done for him). I suspect at some point I'll need the fire selector spring on mine sorted out (might mofset it at the same time).
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Oh should add I keep the following URL for reference as it covers the good and bad points