| I'd look for somthing with a 100 GPD output, or you'll be waiting forever anytime you want to make water. Maybe consider a pressure booster pump as well. Great deals can be had on both on eBay. The actual internal filters are only made by a few different companies, people just slap their names on the filter housings.
It's probably not necessary to plan every little thing until the end of time, but it's a good idea to try to plan out the fish if you can. There may be an optimal stocking order for the fish you want to keep, and that's something you'd want to know in advance. | 
