Be absolutely sure to get a "pressurized pond filter" and NOT a "gravity fed pond filter"...
If you search this forum for "Bio Force 2000" you will find several threads where I have described my experience using them at length including tips I've learned to make them more practical...
In short, I used one indooras for over 5 years on both a 300 gal Rummbermaid and a typical 125 Gal aquarium. They do come with some additional concerns, but if they are addressed wisely, they work excellently for indoor filters.
They are no louder than an indoor canister. The only sound they make is the sound of the pump humming, thus they are as silent as the pump you choose...
My only experience is with the Bio Force, but from my understanding other brand "Presurized Pond Pumps" should work just as well.
The Bio Force has stock foam disks as well as room for about 1.5~2 gallons of bioballs or other bio media. For finer filtration fwelt fabric can be placed between the foam disks, filter fabric can be placed in the bottom after the sponges. It doesn't use "baskets" but if your a little on the creative side you can use just about any media.
All in all, with the BioForce 2000 you get just over twice the flow rate and almost twice the media capacity as an FX5 for around the same pricetag.