Was in the same position as you but wanted to buy new on the basis some of the used ones I looked at had a lot of part close to end of life..
In the end went for a RockRider 5.3 – £329.
Ticked all the boxes for the MRS (size small frame was one of them) and surprisingly the bike rides really well with a better spec than other bikes at that price range. Could of got a lesser speced HardRock or base model Felt, but spec wise the B’TWIN felt a better purchase..
Spec –
Frame T4 T6 6061 aluminium; 1.90 kg in size L; sloping; reinforced tubes; light and responsive sports frame. Sloping: inclined top tube for superior handling and stiffness. Same geometry as the series 8 bikes. Can be fitted with a pannier rack.
2
Fork / Suspension Rockrider XCR 100mm lockout fork by SR Suntour: lightweight and durable coil spring fork. Pre-stress and lock adjustment. 100mm travel, magnesium shafts. The damper finish ensures long-lifetime.
3
Drivetrain 9-speed SRAM X-5 shifters; Shimano C050 front derailleur; SRAM X-5 rear derailleur; SRAM PC951 chain
4
Chainset / Cassette Suntour XCM 302 22x32x42 aluminium chainset with SRAM cassette
5
Brakes HAYES MX5 cable disc brakes. Effective and powerful braking even on difficult terrain such as mud.
6
Handlebar / Stem / Steering Oversize 600mm Rockrider Handlebar by JD; Rockrider 6° oversize stem by JD. Aheadset VP A71 headset: Raised wide handlebars help you stay in control in all situations.
7
Wheels RIGIDA SPHINX 32-hole rims; Formula disc ready DC19/DC22 hubs; Mach1 2 mm stainless steel spokes with sealed bearing hubs and disc brake-ready. Double-walled rims are extra solid.
8
Tyres New Hutchinson Python tyre
9
Saddle / Seat post Rockrider by JD seat post; new Rockrider Sport saddle
10
Pedals Wellgo platform pedals.
11
Weight 14.4 kg in size S, not including pedals
Worth a look at, other option is the Vulcan at Halfords, (which was £399 i think) or they have another at around £320.
Cheers