@Justin, thanks for getting back to me.
So, I did a rewrite, however as long as I did not comment out both the 'app 
= QtGui.QApplication(sys.argv)' and 'app.exec_()', running the code would 
still cause my Maya to hang... Any ideas?

But still, I would like to have some insights if the code that I have 
written is the correct way to go?

# PyQt4 Modules
from PyQt4 import QtGui, QtCore
import sys
import maya.cmds as cmds

class BasicDialog(QtGui.QWidget):
    def __init__(self):
    def initData(self):
        data = QtCore.QStringList()
        #data = []
        geos = cmds.ls(type = "mesh")
        sel = cmds.listRelatives(geos, parent = True)
        for item in sel:
        # Model
        self.ui_model = QtGui.QStringListModel(data)
    def initUI(self):
        listView = QtGui.QListView()
        layout = QtGui.QVBoxLayout()

if __name__ == "__main__":
    #app = QtGui.QApplication(sys.argv)
    win = BasicDialog()

Also, another question I have is, is using 'data = []' the same as 'data = 
QtCore.QStringList()'? In my case, which would be better? Seeing that both 
seems to be giving me the same results..

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