I wouldn't consider the benzene ring as a substituent. In that case it would be (4-bromo-1-ethyl-3-methylpentyl)benzene.

Benzene should be act as a substituent when the longest cabon chain is more than 6 carbons.

Benzene should be act as a substituent when the longest cabon chain is more than 6 carbons.

Not nessisary right. A hydrocarbon containing a small ring attached to a long chain is normaly named after the chain and vice versa. But there are some exceptions.
ex:
phenyl-CH₂-phenyl  named diphenylmethane
phenyl-(CH₂)₅-phenyl named 1,5-diphenylpentane

The reason for this is that chains containing several side chains or  cyclic radicals are named as derivates of the acyclic chain.

It would be 2-Bromo-3-methyl-5-phenylheptane not  because of number of C atoms(it's insignificant here) but because of the presence of Br(which has to be taken as functional group here) in the aliphatic chain.Another example-

    C6H5.CH2.CHBr.CHBr.CH2.CH3  would be 2,3-Dibromo-1-phenylpentane.

I AM NOT QUITE SURE ABOUT ALL THESE. PLZ CORRECT ME IF IAM WRONG.      

I don't think it's possible to say anything about the stereochemistry in this case. So you can't use (2S,3R) in yhe name.

True, but it does form a stero center, so you have to put either R or S. Depending on how you want to name it.

True, but it does form a stero center, so you have to put either R or S. Depending on how you want to name it.

There are three stereocenters in the molecule, by the way.  You can't make any assumptions about the stereochemistry from how it is drawn, so typically no R or S labels are added at all.  Perhaps you intend to say that the compound is racemic,  however, it is not necessarily racemic since there is the possibility of diastereomers.

this is the problem with IUPAC Nomenclature that I've noticed....too many possible naming, why don't we just stick to 1 and get it done with, let's even rid of the common names

I think common names are definitely on the way out, but old habits die hard.  When in doubt, I go with the name that AutoNom generates through ChemDraw.  For this compound, it suggests that the name should be 1-(6-bromo-5-methylheptan-3-yl)benzene.  I can't tell you how it arrives at that name, but it presumably follows the IUPAC naming conventions.

If you've ever tried to read the IUPAC guidlines on the IUPAC website then you're probably even more confused than when you started.  I've gone there looking for answers to a specific naming question and given up after an hour of futile searching.