Gee, as much as I'd like to recommend some specific items, I need more information to understand your goals. You've passed an MCP exam, so I know you're potentially interested in Microsoft certifications, but you also work at a telecom company so you've obviously got some experience and interest in working on carrier infrastructure as well. If you can tell me what kind of network certification interests you most, and whether you want to stay in network admin as a LAN administrator or a WAN administrator, I can probably make some good recommendations. Also, do you want to stick with Microsoft? What about Cisco? Does your job entail working with straight-on telecom gear? What about Nortel, Avaya, Lucent, and so forth? Please tell me more about your current situation and your career goals and I'll come back with a more nuanced set of recommendations.
If you are going to stay with a LAN admin course then definitely get Net+ to start with. It ensures you have adequate knowledge of the basics with networking at least.