i owuld not get an all glass aquarium. you do get what you pay for. Having a drilled tank is mone of the most wonderful things ever!! you really should think about it.
other thought. I am gettting a 190, you may want to look at everything you are going to have to buy to make the tank work before you have your heart set on a big tank. they are VERY expensive, especially after you get above the 120 line. i am having to spen about 400-500 on just my pumps. i am custom building my stand and hood so i will save the 600-800 there but . . . . you will not be able to find a 150 gall for less that 350. and that is the non drilled all glass tank. tempered glass is cool but once it is in it's plate form it is done.
my 190 is an acrilic (sp) 5 foot. since i am good friend with a local LFS guy he just put me into contact with the manufacturer, and i am going to go pick it up by my self. it will still cost around 650.
so if you still want ot do it punk rock and by all means. just remember that things get REALLY EXPENSIVE when you get that big.