can we terminate ISP line on HWIC-1FE card.
And if we use 4 ISP line on one router each line is 2mbps.for thise solution, which router is best.
Sure you can. To terminate multiple circuits you can also use the etherswitch module like hwic-4esw. The limitation is that these don't support more than one PPPoE per card.
Any modern router will do, starting from 18xx and up. Choice is often made by budget.
Hope this helps, please rate post if it does!