Michael,
WELCOME to the ECL part of the forum! Good to have you on board. One area that has helped a lot of us out: Start with the "List your Set-ups" thread. Take a look at the power systems folks have used with typical "40" sized birds and that should get you a feel for what you are lloking for. You should be able to find a few Primary Force ECL conversions listed.
Motor: Arrowind 2820 (from Brodak), Axi 2820, E=Flite Power 25 (Horizon), MaxxCimm HC3522, Quantum 2820 (Randy Smith), Scorpion 3020, or Turnigy SK35-42 Are all about the same size and fit the "40-45 siZe pretty well.
Battery: 4-Cell of 2500-2800 mah, like the arrowind (Brodak) 4Sx2800 pack. Horizon & THunderPower have excellent 4Sx2600 packs. THe new Turnigy "nano" packs are state of the art and VERY cost efective!
Charger/Balancer. The best buy PERFORMANCE & price is the HobbyCity Accucel 4, but the Accucell 6 (up to 6 cells) and the Accucell 8 (up to 8 cells) will give you room to grow.
ESC: Favorite choice is the Phoenix 35, 45 or the ICE 50 - the ICE also has a built in flight data logger that gives you great info on motor performance & power usage. The Shulze (not sure which model) has designed-for-ECL features and a great reputation - but they have not caught on in the same numbers.
Timer: the Wil Hubin timers are my favorite, you can get them pre-programmed, or for a bit more, you can get the timer and a programming box (do a search for the FM9 timer)
Hope I have not scared you away! Keep an eye on what folks post here in your thread as well as all the others, collectively we WILL get you airborne!