for plants I'd go with anubias, hygrophila difformis, java fern, java sword... I personally like anarchias, it grows fast and is easy to propagate. I recommend picking up a bottle of flourish too.
I have just petsmart brand name heaters and they work fine and keep the water at a constant temperature. Another good brand which is probably better is marineland. you'll what about a 250 watt heater.
if you're going to planted I'd recommend a canister filter such as fluval, rena, or eheim. Check amazon.com. Marineland does make good hot filters
I don't know what fish you want so it's hard to say if it will work out. Pearls are generally not very aggresive at all compared to others.. no guarentees
hope this helps