Both the XB303 and XB305 would be suitable for your tank size and volume. If you have the space and budget, go for the larger XB305 as it has extra filtration volume to hold more bio-media.
Get a single or double tap and install it on the outflow hose of the filter, then you can adjust the flow rate lower if required.
There are various surface skimmer add-ons which can replace the intake pipe... but for your shorter tank height, you will need to go for a smaller design. Here is one which i saw online which might match your requirements:
Source: http://world.taobao.com/item/5202673...4650.55.hq07Lo
Not sure if our local LFS have started to stock this design yet though, i guess you can check around... or just order it from online.
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