Most of the Picatinny rail brands are about the same. The main thing is that you know that a steel rail is stronger and less wear prone than an Aluminium one but it's heavier. So if weight is a factor go Aluminium if you want strength and better return to zero after mount removal go steel.
Badger Ordnance P/N 306-07F Long action, ZERO cant, 5.5 oz. – MSPR: $150 http://badgerordnance.com/base/
, Night force are good rails. Make sure you get the right length rail for the sendero action not a short action rail.
You also need to know that a Weaver rail has narrower recoil slots than a Picatinny rail . Everything else is the same. This means a Weaver scope ring with a recoil bar under it will fit a Weaver rail and a Picatinny rail but a Picatinny scope mount will only fit the Picatinny spec. rail in general. Some over spec Weaver rails will be an exception.
What I would do is install a standard no taper steel Picatinny rail of the right length to the action first . Something like this in a stronger 7075 Al if you want aluminium http://www.midwayusa.com/product/131...00-long-action
or something like this in steel http://www.midwayusa.com/product/557...g-action-matte
or this http://www.midwayusa.com/product/879...on-matte-steel
then buy this mount in either standard no taper for average hunting ranges or whatever MOA taper you need for long range shooting . 20 MOA taper for upto 1000 yards .
MSP Variable Eye Relief Scope Mount and 30mm Rings with MOA: MSP Scope Mounts
Ring inserets for 1 Inch scopes at the bottom of the page and taper or no taper bar selection at the right of the page
With this mount system you can mount a short scope or a long scope and get it in the right eye relief position. It is quick detachable and once you remove it any long range taper is gone with the mount and the long range scope and what is left on the gun is the standard flat steel Picatinny rail that you can mount any kind of Weaver or Picatinny mounts on for any other kind of sight . A short range scope , red dot sight , Halo sight whatever .
You could even have two or more MSP QD variable eye relief mounts one with the long range scope with 20 MOA taper and one with no taper and the short range scope no taper and one with a red dot sight or whatever all quick detachable .
With just the flat rail and a set of low rings on a short range scope the standard stock height may be ok but as the scopes get bigger and you add the higher MSP variable eye relief mount then the stock cheek height ( comb) needs to be higher to support your face. A stock with an adjustable cheek piece is good when you are changing scope heights and mount systems that are all at different heights .
If you stick to one scope height then you can build up the comb height with add on strap on supports off various designs if necessary .
If you look around the MSP site you will see lots of QD track and scope ring options .
Scope mounting is the most difficult part of buying a factory gun in my opinion and it should never be rushed . You should take your time and do a lot of asking , looking and thinking about what you really need before you buy.
Once you have the rifle then you buy the scope you want then you buy a suitable mount system based on the scopes dimentions and then you adapt the stock comb height . It does not work very well in any other order.