My 2500 gph intex cartridge pump has died. I can replace this pump with one just like it for $88 from Amazon. being on a tight budget this is the most attractive option. But every year for the last 5 years I've talked about upgrading to a sand filter pump. My question is whether it is worth the extra money to go to a sand filter pump or should I stick with the cheaper cartridge pump? Then, any recommendations on a sand filter pump for under $200?