For a relatively simple route to 2000 builder base Trophies we at SuperCheats are recommending the sole use of archers as your attacking unit.
You will of course need to upgrade your defenses as you still need to prevent your opponent from destroying too much of your base and also max out the number of training camps you are allowed as soon as possible, but in terms of attacking units and what units to spend your Elixir to research, just focus on archers. Let me explain my reasons...
1) The Cloaking ability is awesome
This allows you numerous seconds (depending on your archer level) to pick off targets before getting taken out by base defenses. Even better, it allows you to take out some base defenses before they even get to fire a shot.
2) Tons of units to set off traps
You'll have ample units to spread around the base, this will allow you to set off traps with possibly just one unit, leaving the way clear for other units to come in past the set off trap.
Strategy
Let me explain a little how I play currently:
Evaluate the base, look for easy weak targets and work out if I can destroy them with one, two or three archers, before the cloak expires. Clearing the targets around the base defenses first is usually a good idea as you can then add in a couple more archers once the route to the base defense or even town hall is clear.
This is not a 100% failsafe plan, but if you master this way of playing you should be winning more than you lose and in time creeping up the trophy rankings.
Who knows how far this technique will get you, but I think as bases get more sophisticated, we will need to change our strategy and use other units too, so when you have spare Elixir, don't forget to research the other units as well.