You can study this forum first for better understanding of equipment. It will take 2-3 days of your time, but will bring you a lot of knowledge.
Just some important details:
1) Air cooled Synrad 30 Wt tube = Water cooled glass 60-80 Wt tube.
2) If you need equipment for cutting only and have limited financing - chinese equipment is your choice, but better buy from local dealer.
3) If you need equipment for cutting AND engraving - better buy something like GCC, ULS, Epilog.