I think you are right on the win now. And the last game really showed, an ace would be nice. We were facing Hammels, who pitched a complete game. They faced Richards who got pulled in the 6th. In a long season, having a solid rotation is key. In a one game playoff/playoff structure, having aces is key.
Ace and a #4 hitter to try and win it all.
If we stand pat, do we compare if the Rangers stand pat, or the Astros stand pat? Astros also have plenty of money to spend. Rangers core is coming back next year and they should get Darvish back.
Rebuild. With Trout on the team. I really don't think this is an option. Rebuilding now will put us on the same road as the Mariners with Arod, Griffey and the Big Unit.