Go for the 30-06 (180 gr. Nosler Partitions) if this is your first high power long gun. If it just has to have the word "magnum" in it, then go for either the 7mmRM or 300 WMand NO I wouldn't go higher or lower than those. You may be able to find one of those at $250 used. All other things equal, I anticipate the 30-06 will be cheaper. It is a classic and is equally reliable to theothersin terms of function. In terms of reliable in taking game, it will hold its own. Get the 30-06, for your first rifle power isn't everything, versatility and friendliness is. Get the 30-06.