go with the tree stand
Both are great tools, but the stand is more crucial to a beginner.You can always mark out a few distances ahead of time with a small ribbon. You can practice estimating ranges and increase your skill at estimating ranges.The range finder is nice as long as the deer stand next to the object that you have ranged prior to the shot. You double you movement by trying to range a critter, and then draw undetected. Not to guess at your ability, but you are appear to be new to the sport, and may want to consider taking shots at 20 yards and in before you stretch out to longer distances that require the range finder. Use the left over money to buy a good full body harness so you can hunt for several more years. Just my 2 cents.