Ok i will give you some math to let you know what a high end amiga 1200 would cost ...
Acc board 060 or BPPC minimum 200£ at normal
Mediator Pci 100£ used
tower case maybe 40£ cheap used or 140£ for a new D-box
voodoo 3 20£
soundcard 20£
Lan 20£
Or a bvision for the bppc 100£
fast ata or other 20- 60 £
IF you buy all the stuff new exept the acc you will have to pay atleased 500£ for a system WINUAE can beat any day with both compability as well as speed and you can also browse nicly on that computer ... I would use the stock a1200 for a while if i were you maybe add a 1230... If that computer cant please you a 060 may never ...
Also to buy all the stuff second hand requires a long time lurking at ebay etc and may take months to make ,,.,