Cisco VPN MPLS Recommendation

Greetings!

I am looking for a bit of advice on the best hardware for an upcoming upgrade.  We currently have a WAN with 4 locations connected via MPLS.  The main office has a Cisco 2821 and the remote sites have Cisco 2801s.  The MPLS handoffs are T1s and so each 28xx has a DSU/CSU WIC.  We are planning on moving to a VPN over fiber infrastructure for primary connections to the main office, (the remote offices don't need to communicate with each other.) while keeping the MPLS at 1.5mbps as a failover network.  
We're are going to invest in new hardware, but after doing a bunch of web research I'm seeing conflicting opinions and statements.  So, my question is this:  

Is upgrading to Cisco 29XX with the security bundle and DSU/CSU card the best approach?  Or should I be looking into ISRs or ASAs?

Thanks!
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DMJorgensenAsked:
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Jody LemoineNetwork ArchitectCommented:
The 2901 routers (which are ISRs, btw) with DSU/CSU cards are a good angle. ASAs are principally security appliances and don't have the routing flexibility for effective path control between the two connections, nor do they allow for an internal DSU/CSU interface. What kind of speeds are you looking at for your VPN over fibre infrastructure? 2901s are a reasonable upgrade for T1s, but if you're planning on 100Mb+ on the primary connection, you may want to look at a slightly higher end model in the 2900 series.
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DMJorgensenAuthor Commented:
Thanks for the info.  I was thinking of 2901s for the remote sites and a 2911 or 2921 for the main office as all the remotes site connect there.  My vendor recommended ISR 4321s for all locations, but I'm not sure what the difference is.
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Jody LemoineNetwork ArchitectCommented:
The 4300/4400 ISR units are the latest generation of Cisco routers, but may be overkill for this application. Again, it depends on the bandwidth provisioning on the fibre connection.
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DMJorgensenAuthor Commented:
After doing a bit more research, we are going the ISR 4321/4331 models.  The VPN bandwidth on them is much higher than the 29xx series.  Thanks for the help.
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