No problem... this is a cradlepoint router:
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www.newegg.com/Product/P ··· -ProductNotice how its 159 right now... well newegg lowers the price to 109.99 pretty regularly... it has actual ethernet ports and wifi and is is a full router. The mifi is wifi only and while it is very handy and portable it doesn't have all the features that a normal router would.
You wouldn't need a modem other than your current MC760.
One advantage the MiFi has is that it has a battery built in so it is truely portable... the cradlepoint requires a wall adapter.
I personally use a rechargeable powerpack to run my cradlepoint for hours at a time while out and about... so it is possible to use it in a portable mode... it just takes up much more space than a mifi for portable use.
I own a MiFi myself but I have to admit I use it as a modem more often than as a router ... as a modem it works great but as a router it tends to power itself off for no reason and its feature set doesn't compare to the cradlepoint.
Here is the official cradlepoint page:
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www.cradlepoint.com/prod ··· s-routerCheck in this forum, or sprint, or mcom forums as people usually mention when newegg drops the price to 109 for the mbr1000.