If your flying for fun then its up to you. If you don't have your complex endorsement yet, then you could go up with an instructor and get it. It shouldn't take more than 30 minutes of ground instruction on the systems and emergency procedures and then about a 1-1.5 hours of flight for the endorsement (although insurance might require more time). Complex airplanes typically fly a little faster than your run of the mill C172 which makes them more fun but require a new level of responsibility since the gear isn't welded on. Depending on the aircraft type, it might not be a $70/hr difference if you take into account the higher true airspeeds in cruise and the shorter flight times when compared to the non-complex aircraft. Do the math and see how it works out. It might be worth it. On that note, if your planning on just staying in the pattern (which you shouldn't be doing anyway... start racking up that Part 135 x-c time!), don't waste the money on the complex airplane.