Since you're starting in the hobby... I'd go with the 125 and a big canister filter (Like the Eheim Pro III with built in in-line heater [2180])... and keep it at that for a while. You'll have great filtration and a really simple, and easy to maintain set-up. There is no need for chillers or protein skimmers with a fresh-water setup.
Pick up about 100 pounds of pool filter stand from a pool supply store, a 100 pounds of river rock from a landscaping company... and you'd be good-to-go!
Good luck!
- Jonathan
Pick up about 100 pounds of pool filter stand from a pool supply store, a 100 pounds of river rock from a landscaping company... and you'd be good-to-go!
Good luck!
- Jonathan