jervis, dun jump into sps so early. Cuz sps can mean a lot of things such as higher maintenance, as little fishes as possible in ur tank.
will u be considering using a zeovit reactor? Quite a few reefers here have success keeping sps using one, but have to read up on how it works.
You definately need a huge CR to feed the sps. Tunze 6100 x2 is not enuff for the 4 footer. Iwarna's 5 footer sps tank got 6 x tunze and wavebox!!!!
In the long run, u will realise its a lot more expensive than keeping lps or fishes, but its probably more rewarding.
As for the lightings, minimum is 150 watt x 2, supplement with t5 tubes.