The dimensions which make the biorb such an attractive choice for those short of space, also limits the number and the kind of fish you can keep in it.
A traditional 60 ltr tank (24x12x12 inches, 15 US gallons) will give you much more swimming space and surface area, and is not actually a bad starter size. This would enable you to house 6-8 fish in the 2 inch range, or 10-15 smaller fish (1. 5 inch). So enough for a group of 6 tetras and a small group of smallish livebearers or corydoras catfish, just as an example. A Juwel Rekord 60 will come with all the bits (though you may want to get new light bulbs) and should cost quite a bit less than the price you quoted.
You will want to look up the pinned topic on cycling a tank, since the early weeks are crucial to the fish's survival (and to your enjoyment of the hobby). For the first few weeks, expect to need to be around to test the tank every day, whether you do a fishless cycle (highly recommended) or cycle with fish. After that, you should be able to settle down to a routine of weekly water changes.
If you are seriously pushed for space, a betta tank may well be another option; they can be happy in a 4-5 gallon tank. Just ignore toppman's sexist twaddle, there are loads of male betta breeders, and there are females (like myself) who can't stick bettas at any price.