Electrical Questions, Any Electricians or Experienced Growers with Advice?

Hey RIU,

I just realized that I have a 100-150 Amp house-wide limit.

I currently have the usual items running

Fridge
37" Flat-screen
PS3
Computer
Small Dishwasher
A few lights

I was planning on getting:

2 x Magnum 357 LED's
Pumps, Timers, Fans, CO2, ect

Am I going to run into major power problems considering my limitations?
If I run extension cords to more evenly distribute the power load will that fix my problems?

If i am going to have major problems is there any way to circumvent them?

Thanks for the help in advance everyone, sorry for all the questions!