Radeon 9200SE or Ti4200

I've been advised to go for a Ti4800 or 5200 but I can't manage to get them on ebay (where things are far cheaper, even new.
I've only got around $150 but I can get either of the above for around $AU75 (which is about $US55) at ebay.
I'll probably end up upgrading later, but the PC is only 'Mid range' so I see no point in wasting too much on a very expensive card without the resources to run it at its full capacity.
Which would you go for? And is the price 'right'??
Also does it really matter which 'Brand' (Asus, Gigabyte, NVidia etc) Radeon or GeForce that you get???
Thanks
I've only got around $150 but I can get either of the above for around $AU75 (which is about $US55) at ebay.
I'll probably end up upgrading later, but the PC is only 'Mid range' so I see no point in wasting too much on a very expensive card without the resources to run it at its full capacity.
Which would you go for? And is the price 'right'??
Also does it really matter which 'Brand' (Asus, Gigabyte, NVidia etc) Radeon or GeForce that you get???
Thanks