My advice would be to try and pick something you are particulary interested in and then focus and specialise in it. You've already done your CCNA, so if you like networking then perhaps consider taking your Cisco accreditations further with a voice or security qualification. There's big money in security and you can earn anything up to £750/day (if you're shit-hot) doing security roles in the capital. Generic (routing/switching) Cisco engineers can still command £300-500/day no worries, but there's more money if you go into the specialist areas.

Don't bother with the MS certs unless you really want to be stuck doing a support job. You don't really need them for doing 3rd line work, which is where the money is at. There's a reasonable call for Messaging though, so perhaps just doing an Exchange MCP is a good idea if you like that kind of thing.

I personally am a technical architect and I can still command 450-550/day, but the market is particulary tight at the moment and i'm up for renewal next week!!

As chip says, you need to be confident in what you're doing to be a valuable asset to a client. They want you to pretty much jump straight in at the deep end and get on with it - they are paying a stack for you, afterall.