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You can transfer about half your stock from your other tank into the new one. You need to worry about keeping the fish you have happy before you look at new anything.
a sump is nice because not only does it hide everything, it also hold more water thus polutents are diluted more and will take longer to harm the rest of the aquarium. but a large canister filter is possible to be run as well
its a submersible filter so it takes up space in the main tank and when you clean and change the pads you have to stick your hands in introducing more pollutants to the water
Also if you get behind in cleaning that filter it will cause a nitrate spike as this type of filter are known to do. also you will cut down on the effect of your LR as the canister will steal nutriants that the lr need.
Westie,I would definatley buiild a custom stand and use a sump,even if you add the sump later,what about using your other tank once you've transfered everything,cant remember what tank it was though.