Advice on Contact Mgmt Pgm-Large Scale F

I have a client who owns a Used Truck Dealership. He is expanding to approx 15 users on Act 2000 for calling, faxing and e-mailing potential customers. He wants to send out 500-1000 faxes a night and eventually include e-mails as well. The ACT database will be grouped by different client types, ie Truck Types, to taget specific audiences.
Does ACT handle 10s of thousands of contacts? Can it fax by groups? What are other Contact Management options?
Also, what are the requirements across a NT network for the modems? Should we use multiple modems or a fax server boards? Thanks in advance, Tom