I wouldn't redo the dark angels, at least leave the old models as they are. Adding new ones would be okay, but if you think your painting skills have increased, you can collect a new army as well, because you won't use models of both "generations".
If you want to play Space Marines, play Blood Angels. Not only are they compleately imba, they also have a small version of the Thunderhawk (Sickest gimmic to bring people to buy the new Blood Angels ... /ironie off)
I votet for Tau though. They are cool and every one plays freakin Space Marines, it's just boring. If you change the heads, even the battle suits look good.
If you want to play Space Marines, play Blood Angels. Not only are they compleately imba, they also have a small version of the Thunderhawk (Sickest gimmic to bring people to buy the new Blood Angels ... /ironie off)
I votet for Tau though. They are cool and every one plays freakin Space Marines, it's just boring. If you change the heads, even the battle suits look good.