Which one I'd choose? Claw (Highest ratio of Performance:Dollar of the lot)
Value for money would be the trademe PC - IF: if doesn't break, because I don't know what the aftersales service would be like. It has no OS but I could give you a windows 7 key. It's more cumbersome. Computer lounge is hassle free.
If I value hassle free I'd go computerlounge (remember to add the 2TB HDD, 256GB is not enough). If i really need the few hundred quid and don't mind the hassle the trademe PC is a very similar PC once you get the OS installed.