All the 3 filters you mentioned are suitable for the tank... Totto is one of the best hang-on filters that replicates the efficiency of a sump filtration with directional output, though its quite an expensive product (3-4x more than the mini canister filters).
The Tom Rapids Mini Canister filter and Shiruba XB-301 are similar in design, but the Shiruba is better in that it uses layers of media baskets (rather than the basic 2 compartment design on the Tom Rapids), and the Shiruba comes with hoses that look nicer (not the weird ribbed ones on the Tom Rapids).
The benefit of canister filters is you can place it beside or below the tank (can hide it away out of view), and also use different lily pipe inflow and outflows with it, so they allow for more levels of customization. If the flow is too strong for the tank, just install a single tap on the outflow hose to control the flow-rate.
As for the ISTA Co2 (1L) package, is it this version? http://www.istaproducts.com/product/...-professional/
It should work, just that with a 1 liter tank, you will need to refill it more often than a 2 liter or larger tank.
You can compare it with other Co2 system packages like the ANS 2L Professional Co2 system (compare and see which is more worth it): http://www.eastoceansg.com/ans-2l-pr...em-p-1006.html
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