Our company is switching ISP's in six months. The new ISP is having me jump through hoops to get a class c, which my current ISP provides us. During the switch, there will be a lot of updating, DNS, Firewall, IDS, etc.
Is there any reason why I wouldn't want to buy a block of portable IP's from ARIN? What are the pros and cons of that? I already have an ASN, if that helps.