These prices don't seem so bad. I have seen much more expensive ones quoted on this site. On the other hand, I don't know what they mean by 3kw and 2.5kw. Normally they are rated in btu and you would need a 12000 btu for a largish living room and 6000btu for a bedroom. We got ours from Carrefour and the 6000 btu is ideal for the bedroom but needs two for the living room. Our units were 190 € each and fitting for both was €200 (sorry, but the details of the guy fitting them are in Spain so I can't give you a phone number) so we paid €580 for two fitted. I note Carrefour are now selling 9000btu split aircons for around 200€ but are advertising them as €385 fitted (I think that was the price) so thats worth looking at.
Also, do the ones you have been quoted for do both aircon and heating? We found the heating a real boon when we went over in January. The only problem with them is that they can get a bit noisy. The living room one, being underpowered, is on all the time so stays noisy whilst the bedroom cuts out when the room gets to the required temperature.
The prices you have been quoted sounds good as they are probably a step up from the ones the Carrefour sells. I have seen 2,000 euros plus quoted for 2 units which seemed a bit excessive. Our new place has aircon vents fitted so we will only need the outside unit fitted on the roof but I haven't had any quotes for that yet.