Is a pos system an overkill for an Antiques Store ?

Innitially I wanted to be able to dispatch quick and eficently the clients and customers, avoid mistakes with the check out, be sure that employees process correctly the checkout just by reading code bar from the labels, limiting intentional&unintentional price mistakes PLUS have a link/integration with my accounting which might be Microsoft Small Business Accounting or might Quick Book Pro. (I am still evaluating both) For both cases there are interesting POS solutions.

DATA: Most of the merchandise is unique , once sold, never have again the same one (similar yes but never the same) so no reorder points or tight inventory controls and systems.

DATA: Inventory control...Just matching monthly the physical inventory with the one indicated by the software.

DATA: I do not have more than 400 items in my whole inventory.

DATA: I do not expect more than 5 transactions per day (average)

DATA: Some is done cash, most is credit.

I would be pleased in knowing opinions and similar experiences .

Thank you