JV, if you were on a short timeline, based on the requirement of not losing features, I would say that BES would be your best option, albeit more expensive.
If you did not have a timeline, I would engage RIM to see what their plans are regarding the BPS platform in the 5.0 family. As Si mentioned, BPS will be EOL as of the end of this year and there have been no updates to it (aside from security fixes for the widely publicized PDF vulnerabilities) for quite some time now (almost two years). The profit margin for BPS is likely a sinking ship, so I'm not sure if RIM will continue the trend on the 5.0 platform (rumors are they will, but the current economic climate may dictate this sort of decision on their part).
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BCSA (4.1, 5.0) | BCSD (4.1, 5.0)
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