I'm comparing a few bikes, considering upgrading from my Trek 1000. I'm just looking for opinions on the quality of the bikes. Most of these are sitting at my LBS shop, all between $1500-1750. Here they are, in no particular order:

1. 2004 Klein aura xv
crankset Shimano Ultegra 53/39
bottom bracket Shimano 105
derailleurs (f/r) Shimano Ultegra
shifters Shimano Ultegra STI
wheel system Bontrager Race Lite Road
tires Bontrager Race X-Lite 700x23C
cassette Shimano HG-70 12-25, 9 speed
brakes Shimano Ultegra
brake levers Shimano Ultegra STI

I'm pretty sure this has carbon seat stay, and carbon fork, but the Klein website sems to indicate otherwise.

https://www.kleinbikes.com/us/road_bi..._xv/index.html

2. 2005 Klein Reve 5

frame material Klein ZR9000 AL & Carbon seat stays w/ s.p.a. suspension
fork Klein Reve Carbon w/ fender eyelets
headset Cane Creek IS2 w/ cartridge bearings
rear shock s.p.a. soft-tail suspension w/ BASF elastocell spring
crankset 105, 52/42/30, 105 68x118
bottom bracket Shimano 105
derailleurs (f/r) Shimano 105 T / Shimano 105 GS
shifters Shimano 105 STI
chain Shimano HG-72
wheel system Bontrager Race, 700 x 25c, folding

I'm a little concerned about the durability of the spa insert between the rear seat stay and the frame. Also, the componentry is a little lower than the aura xv

https://www.kleinbikes.com/us/road_bi...e_v/index.html

3. Lemond Beunos Aires

Frame: combo of steel and carbon. Carbone top tube, and stays, steel bottom tube, carbon fork
TruVativ GXP external
crank: Bontrager Racer Lite triple 52/39/30
Front/Rear Deraileur: Shimano Ultegra 10spd
Shifters: Shimano Ultegra 10spd STI for Flight Control
Casette: Shimano 105 10spd
Chain: Shimano 105 10spd
Bontrager Race wheel system
Brakes: Shimano 105

I find the combo of steel and carbon interesting.

https://www.lemondbikes.com/2006_bike...os_aires.shtml

4. Trek 2006 5000

Frame: TCT Carbon
Fork: Bontrager, carbon
Wheels: Bontrager Select
Tires: Bontrager Race Lite, 700x25c
Shifters: Shimano 105 STI, 10 speed
Front Derailleur: Triple: Shimano Ultegra
Rear Derailleur: Shimano Ultegra
Crank: Bontrager Race 53/39 or 52/39/30
Cassette: Shimano 105 12-25, 10 speed
Saddle: Bontrager Select
Seat Post: Bontrager Carbon
Handlebars: Bontrager Select w/BzzzKill, 31.8mm
Stem: Bontrager Select, 7 degree, 31.8mm
Headset: Aheadset, sealed, alloy
Brakeset: Cane Creek 3 w/Shimano 105 STI levers

I'm not terribly concerned about the TCT overseas carbon vs. the US made OCLV.

https://www2.trekbikes.com/bikes/bike...id=1461000&f=3

5. 2005 Scattante CFR Triple

Full Ultegra components, shifters, deraileurs, etc.
Unknown carbon frame
"Korso" wheels
apparently a pretty crappy seat and seat post


https://www.performancebike.com/shop/profile.cfm?SKU=21251

Does anybody have any strong opinions about theses bikes?
Is there a huge jump in quality going from the 105 to the Ultegra components?
Any other comments would be greatly appreciated!