well you're evidently very ambitious, but you have as many errors in your post, as you have misconceptions.
Firstly A+ is an entry level cert that will teach you about hardware and the BIOS, not security. If you want to learn about hardware rootkits and low-level coding, you definately won't get that from A+.
Secondly, MCP and MCSA will make you a Microsoft System Administrator, which does include some security aspects, but is very different from a Network admin.
A system administrator is responsible for the corporate LAN, (workstations and servers), i.e. He/She manages the Active Directory, Domain Controllers, user accounts, rights and priveleges, Services such as DNS, DHCP, RRAS, storage, backups, e-mail, databases, etc.
A network administrator is responisible for the corporate WAN and internet links. His/her responsibilities include configuring and managing routers, switches, firewalls and other network equipment, setting up links like cable, DSL, ATM, Frame Relay, etc. The network admins job includes understanding routing protocols (IGP/BGP), spanning tree, configuring QoS, VPN connections, VLANs, firewall rules, access lists, etc.
Another misconception you mention is that geting the certs will give you experience. This is wrong. Getting a cert only means that you can pass that vendors exam, and even that does not mean that you really understand the subject matter, or that when it comes time for hands-on, that you'll actually know what to do. The only way to get experience is by working hands-on.
If you dream of being on a Tiger Team, I recommend that you get some background in both Microsoft and Linux/UNIX system administraion, and also background in router and firewall administration. Don't run before you can walk. First get some entry level certs and some hands-on experience, and then come back and ask the same question again. By then not only will your perspective have changed on the security market, but your preferences and priorities may have changed too.
P.S. I don't think that there are many certs that a CISSP would want to get in order to advance their careers. It all depends on what interests you and what you want to do with it. As far as advanced level certs go, take a look at RHCE and CCIE.