not sure about price $$ for new 2005 model.
u expect roadwin to cost about $7k++, if u r age <31 expect to pay additional $300 for ur insurance premium.
best u go down with ur uncle to cka hq n talk to cka sale representative, they normally can workout some kind of deal for u.
if u use ur uncle's name u might save tat $300 hundreds on insurance premium, not sure when ur name is add-on as sub-rider it will save tat much.
roadwin is more expenisve than those made-in-thai bikes, u probably save a thousand $$$ if u buy new those made-in-thai bikes like honda phantom/nsp/wave/cg/cm, kawa kips, yamaha sonic/125z/x1/ybr/yzr/tzm, suzuki en/es.
since roadwin started with 2004 model, u can hardly find any secondhand roadwin bike on sale in sg.
i would suggest u shop around before deciding to buying new or secondhand bike becos it largely depends on ur financial situation.