Some stuff I found last fall when buying a bike for my son...
Overall guides I thought were worth bookmarking:
Components I found to be significant: derailleurs, shocks, brakes. Most other components seem to be all above some minimum level of quality that matters to me, so I chose based on those components.
Derailleurs: Rough map by manufacturer. Format is Shimano number, Shimano name, SRAM name.
- 700 - Tourney - x
- 800 - Tourney - x
- 2000 - Altus - x
- 3000 - Acera 8/9 - X3/X4
- 5000 - Alivio - X5
- 6000 - Deore - X7
- 7000 - XT - NX
- 8000 - SLX - x
I've accepted some communal wisdom that says your ideal state is to get above the Shimano A names, so Deore or X7 are the level I really wanted to get. Rear derailleur is much more important than front derailleur.
Shocks: Rough map by manufacturer. Format is RST model - Suntour model - RockShox model.
- x - XCT - XC28
- Blaze - XCM - x
- Saturn - XCR - XC30
- x - Raidon - XC32
- x - x - Recon
I wasn't able to come up with a consensus dividing line here, so I was just looking for the best I could get, and this chart helped me compare across manufacturers.
Brakes: Get hydraulic disc brakes, not mechanical. I have mechanical, and every time I ride someone's hydraulic disc bike I'm impressed and envious. Rough map by manufacturer. Format is Shimano # - Shimano name - Tektro model - SRAM model (I think SRAM bought Tektro, but both lines still existed last fall).
- 800 - Tourney - Aquila - x
- 2000 - Altus - Novela - x
- 3000 - Acera - Draco - Level
- 4000 - Alivio - Aurigo M290 (chart is unclear here)
- 6000 - Deore - HDC300 - Level T
- 7000 - SLX/Shado+ - x - Level TL
- x - x - x - Guide R
For number of gears, I looked at
http://gears.mtbcrosscountry.com/#26/2.25I1123I342, found the gear ratio for the gears I actually use 99% of the time, and found that it was a gear ratio of 0.75 to 3.18. Based on that, I ended up getting my son a 1x10 SRAM shifter system that covered almost all of that range (0.79 to 3.02) without the complexity of a front derailleur.
I ended up getting him a BikesDirect Gravity HD 1x10 with Suntour XCT, X7 rear derailleur, and M365 hydraulic brakes for $499. I really like his bike.
I'll try pasting what else I found at various places - it might not look great, but maybe it's useful. The first dozen or so are Bikesdirect, the rest were from other spots I could find.
Cost / Model / Forks / FD / RD / Brakes
- 399 / Gravity HD Comp / Sun XCT / TX800 / TX800 / M365
- 399 / Windsor Trail FS29 / Sun SF14 / TY700 / Acera / Novela
- 399 / Moto Fantom29 Sport / Sun XCT / Sun 8-XCC202 / Acera / Novela
- 349 / Gravity HD Trail / Sun ??? / TY500 / TY300 / T M285
- 399 / Moto Fantom29 X4 / Sun XCT / SRAM 3.0 / SRAM x4 / Draco
- 499 / Gravity HD Elite / Sun XCT / TX800 / Altus / M365
- 599 / Gravity HD Pro / RS XC30 / TX800 / Acera / M365
- 599 / Moto Fantom29 Trail / Sun XCM / Acera / Deore / Tektro ?
- 699 / Moto Fantom29 Comp / RS XC30 / Deore / SLX / Guide R
- 599 / Gravity HD 1x10 / Sun XCT / None / X7 / M365
- 499 / Gravity HD 1x10 / Sun XCT / None / X7 / M365
- 500 / Specialized Pitch / Sun XCT / TX800 / TX800 / Radius M
- 550 / Specialized Rockhopper / Sun XCT / Altus / TX800 / Altus
- 710 / Spec Rockhopper Sport / Sun XCT / Altus / Acera / Altus
- 725 / Spec Pitch Comp / Sun XCM / Altus / Acera / Altus
- 810 / Spec Rockhopper Comp / Sun XCM / microshift 2 / Acera / Altus
- 1010 / Spec Rockhopper Expert / Sun XCR / microshift 2 / Deore /