With clan mechs, to be honest, it doesn't overly matter what variant of the chassis you end up getting. This is because you can change all (but the CT) the omnipods of your mech to any other mech (Variant). This means you can mix and match to get the hard points you desire.
If you really liked the trial versions, then I'd honestly start there and move on from that point. Either that or buy another variant so you can play something different, and then still can fall back onto the Trial if you wished.
Personally, I don't have any of those mechs, as I've been using the Thor/Summoner myself. The Vulture/Mad Dog trial has been working for me fairly well, and I know it's a decent mech. Stormcrows and Timberwolves recently got hit by a nerf, so keep an eye on that. (For the Stormcrow and Timberwolf, if you need to, switch out omnipods to reduce the nerfs. I'd suggest replacing or taking omnipods that have the minimum number of energy hard points to the number of weapons you intend to take. This will leave the nerfs as low as possible for your design.)
All your considerations are rather nice mech choices. Any of them should serve you well.
Edited by Tesunie, 25 May 2015 - 06:15 AM.