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Thank you for your answer. It's very interesting. I have tried asking for native speakers' opinion on this at other forums as well and everybody reacts to it differently. Now let me cite an answer from a Canadian speaker at another forum. I'll be back some time later wishing to know your ideas on a similar issue. Bye, for now. Henry
Before we get too far out there, you have to remember that this advice is being given in realtion to the scenario/context provided by Henz. Change it a little bit and it may well be that all bets are off.
I checked quickly at that other site but I didn't see that the context had been laid out.
Re: modal verbs 
I think they're all three fine. 
Linear Mode
