this question gets asked every week and you really need to do your homework but the 5008 is without doubt the best machine as collin has said,look for a kit that also has a good quality cubicle, there are some on the market that look the same but there not the quality of the material and spring bands are very inferior on the cloned models,
the quality of the solution included in the kit is also a major factor to consider, and the cost per litre of future solution from your chosen company is another consideration,
choose a company that is registered with the beauty guild or has babtac accredited trainers that offer a generic course for all solution types you will need this for your beauty insurance as some companies simply offer a cert for just their solution
why not ring a few companies and have a chat and see who you connect with hth