Good analysis, Aled!
Here's my attempt:
I suspect that no team will win the Grand Slam this year.
Tournament winners: I'd pick either Wales (who look very strong, with an impressive Lions contingent) or possibly Ireland, with a good new coach, most of the squad used to playing and winning together for the Irish provincial teams, and determined to give BOD a memorable final season. The Ireland-Wales match on the second weekend may prove the decider.
Dark horses: France. They usually win the 6 Nations in the season following a Lions tour. Their form's been pretty poor leading up to the tournament, but the French clubs are still performing outstandingly in the H.Cup, and if they can bring club form into the national side they'll be hard to beat. In which case France-Ireland as the final match of the tournament could be a cracker. But a lot may depend on what happens in the France-England match tomorrow...
Hard to predict: England. The pack looks pretty settled, and Billy Vunipola at No. 8 could be a real star. But the backs are such an unknown that it's very hard to predict how they'll go - I certainly can't remember them picking such an inexperienced back division for a 6 Nations game. Some potentially exciting selections there that could be brilliant or they might freeze in Paris and it will all go horribly wrong.
Italy: May win their home games. Including against England in the final match. England traditionally fall apart on the last weekend anyway.
So to predictions for this weekend:
Wales-Italy. Italy will put up a fight as usual, but a strong Welsh team will be too much for them, and in the second half the Welsh wings will run riot. Wales by 15-20.
France-England. Very hard to call. I'd love to see the English pack pound the French and the quick young English backs run in some tries. But that's a lot of inexperience to take to Paris, and if they don't keep their discipline it could go horribly wrong. France by 5-10. But this is a match I'd love to be at.
Ireland-Scotland. Haven't seen the Irish team selection yet, but Ireland should be too strong for the Scots. Ireland by 10-15.
And if anyone can be tempted to have a go at a Fantasy League, I've set up a Medusan League here:
http://espnscrum.fantasyleague.com/To join, you'll need the pin: 58940.
Otherwise I shall be in it all on my own. Though at least I'll win it then.

Likes the warm feeling but is tired of all the dehydration.