Don't feel guilty. I too have a hankering for a 993, although everytime I get back into my 944 I feel much, much better.
Feedback from pals who have had 944's then gone to 993's say that after a 4 hr journey in the 944 you feel fresh as a daisy, but in a 993 you know you've done a 4 hr journey (offset pedals, heavy clutch, noisier), so it's not a 100% perfect car and they all have a reminiscant smile on their face when talking about their 944 days.
I wonder if we would have these inferiority complexes about 944's if their 2nd hand values were comparable to the 911's?? Certainly from a build quality standpoint and other aspects that make a Porsche a Porsche the 944 is easily equivalent to a 993 and in more tangible ways is a better car (e.g. handling). However the 993 seems to invoke those intangible aspects that cloud your better judgement.
I'll definately have a 993 one day but ideally I would like to keep hold of the 944 as I get the impression the 993 would go before the 944.