Only you can decide. In any case, if you're buying art as an investment, original paintings are likely to appreciate more in value than either limited edition prints or artist proofs. Don't second-guess yourself. If you really like it and want it, then buy the original. If you're budget conscious and you want a painting for an investment then a small original is far better than a large print.
Money is always a consideration.
Think of the price of the painting as an investment in your home. Not everyone wants to buy art for a long-term investment. If you're looking for something that is less expensive and YOU LIKE IT, choose a reproduction - a Limited Edition Print or Artist Proof. Consider how you will display the artwork. But by changing the frame or mat you can easily co-ordinate the painting to blend in with your walls and furnishings.