New P3 without Maguara brakes

Has anyone built up a new P3 without the Maguara brakes but with the Shimano brake/shifter lever combo and stock Ultegra brakes?

I am interested in one but really want shifting on the base bar as well as on the extension bar ends.

Is there any downside to this?

Thanks
Power1369

It should just be your average brake setup when using the ultegra. The downside would be losing the awesome Mag braking power.

Another option (if youre handy) is to do a shifter hack and then you get the best of both worlds - http://forum.slowtwitch.com/gforum.cgi?do=post_view_flat;post=4554409;page=1;sb=post_latest_reply;so=ASC;mh=25;

Thanks for the response.

Does anyone have any idea what the resale value of takeoff ie new Maguara RT6 brakes and levers typically has been?

Thanks

http://www.competitivecyclist.com/magura-usa-rt8-tt-brake-caliper?ti=UExQIENhdDpCcmFrZXM6MjoyNTpjY0NhdDEwMDQ3OQ
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Thank you !