I am looking for advise on what type of spinning bike to buy. I am a stay at home mom with a seven month old son, and of course I want to tone up from the pregnancy. My budget is limited to no more than $500 and I have been looking at purchasing a Makoto SB5800. I have taken spinning classes in the past and I used a Nautilus, but they are out of my price range. I am not looking to train for a marathon just yet, but I do plan to use the bike daily. If anyone can offer advise on what brand/model to buy I would greatly appreciate your help.