Here's my situation, I'm going to be ordering the Hangar 9 Twist .40 along with the Spektrum DX7 aircraft version. The DX7 is going to come with four servos. Here are the specs:
DS821 Sport Digital Servos
Torque: 72 oz/in @ 4.8v, 88 oz/in @ 6.0v
Speed: .19 sec/60deg @ 4.8v, .15 sec/60 deg @ 6.0v
Size: 1.50 x .94 x 1.47 in
Weight: 1.5 oz
Ball-Bearing: Single
Motor: Cored

I know these would work for the Twist, but I want to save them for my next model I'm planning on getting, and according to the manual these are overkill for the Twist. The Twist recommends [link=http://www.horizonhobby.com/Products/Default.aspx?ProdID=JRPS537]JRPS537 [/link] or equivalent servo's. The specs on these servo's are:
* Size Category:Standard
* Type:Analog
* Torque:40 oz/in @ 4.8V, 49 oz/in @ 6V
* Speed:.25 sec/60° @ 4.8V, .19 sec/60° @ 6V
* Dimensions (WxLxH):.73" x 1.52" x 1.32"
* Weight:1.58 oz
* Bushing Or Bearing:Bearing
* Bearing:Single
* Motor Type:3-Pole Ferrite
* Gear Type:Nylon
So my question is would something like this work as an equivalent?
[link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXDEL7&P=0]Hitec HS-322HD Servo Deluxe Karbonite Gear Std U [/link]
Speed: 0.19 sec/60° at 4.8V
Speed: 0.15 sec/60° at 6.0V
Torque: 42.00 oz-in at 4.8V
Torque: 51.00 oz-in at 6.0V
Length: 1.60" (41mm)
Width: 0.80" (20mm)
Height: 1.40" (37mm)
Weight: 1.5oz (43g)

The only big difference that I saw was that the JR servo had 1 ball bearing where as the Hitec in a non-ball bearing servo. Whats the difference in a standard servo vs standard ball bearing servo, besides the obvious? And if it does make a big difference to where I should get a ball bearing servo would the [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXDEL9&P=0]Hitec HS-325HB Servo Standard Karbonite Gear BB U[/link] or [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXVW07&P=0]Futaba S3004 Standard Ball Bearing Servo[/link] suffice? I know this may seem pretty obvious to most of you but Im not to educated on servo's and since the Twist is a 3D capable plane I wanted to make sure I had something ideal for the situation. And if you are wondering, I plan on saving the Spektrum servo's for the Aeroworks .46-.60 Edge 540. Thanks for the help.