I get to pick our next vendor for our upgrade. Do I stay with Cisco? Go with juniper? Any other suggestions?

Well. Just got the task that I will be upgrading all the existing infrastructure as Its been 5 years. To be honest our current Cisco equipment does the job fine, but hey they want new stuff so I will not argue.

We are using a catalyst 4500 for our core, IE 4010s and 2960s for distro, and IE 2000s for our access.

I was thinking of transitioning away from IE distro/access as any switch will do our l2 routing.

So what vendor should I go through? Should I diverse it and get a different vendor for each layer?

I think the 4500 upgrade is the 9600.