A little guidance and advice please

Ok as stated yesterday I am getting a 30 gallon aquarium tommorow (YAY) I intend to put my adult mollies into it after it has completely cycled, to cycle I will use a few of my current adult mollies. I am looking at this to use as the gravel http://www.mops.ca/cgi-bin/SoftCart.exe/skus/rs/RSCS-00150.asp?L+scstore+pngj3213ffa99ea9+1177033316 is this ok for a bracktish tank or is it for salt water only? Our water has a ph of 8.4 naturally if that helps any.

I am also looking at this filter http://www.mops.ca/cgibin/SoftCart....00B.asp?L+scstore+pngj3213ffa99ea9+1177034051 but wonder if the current would be to strong for a 30 gallon with mollies.

I am trying to find a heater and really hate the ones that are submersable, I don't like the idea of anything with an electrical cord going into water and I know i would never sleep at night from worrying. This one seems to be ok what do you think? http://www.mops.ca/cgi-bin/SoftCart...402.asp?L+scstore+pngj3213ffa99ea9+1177033553

I had intentions on setting it up right away but due to finacial issues will not be able to for another 2 weeks. I need to get the plants (plastic) and stuff before I am ready to set this up fully, not to mention finding a spot in my 800 sq ft house to put this.

Any guidance you can provide would be great.

TYIA

HMM sorry guys my links don;t seem to work so here is the low doen on my intentions.

ETA...shoot it seems none of my links are working so here is a quicky summary

Heater:
Hydor:
Shatter Proof 300 watt Heater
New aquarium heater functioning with the exclusive
PTC (Positive Thermal Coefficient) technology.
The first shatter-proof heater thanks to the peculiar glass tube.
THEO is shock resistant thanks to the PTC heating element
and the shatterproof glass tube.
Free positioning in aquarium with supplied suction cups.
The patented PTC heating system guarantees operation in complete safety because in case of dry running there is no danger of damage.

Filter:
Marineland:
Penguin 200 Power Filter w/Bio-Wheel

Gravel:
CaribSea:
Florida Crushed Coral (40 lbs.)
It’s the only crushed coral with aragonite, which provides up to 25 times the buffering power of other crushed corals, dolomite, or oyster shell. Eliminate chronic pH problems and provide maximum surface area for water purifying bacteria. CaribSea's Florida Crushed Coral with aragonite allows an increase in bioload by up to 50% and it never needs replacement! No rinsing required.
This product is also able to be utilized in calcium reactors and plenum systems to deliver not only calcium, but also carbonate buffer, and essential trace elements such as Strontium (up to 10,000 ppm!).

Approximately 2-5mm diameter (1/8 - 1/4").