New frame choices- prices, man maths content

Three frame choices:

1.New 650b Intense Tracer frame £1100

2.Secondhand mint Intense Tracer2 £500. Conversion kit to 650b- An extra £100. Is the shock/bearings really mint? No warranty either.

3.A commencal meta v4 £750 frame no shock. £150 for a one ride old Rockshox Debonair shock

So £1100 v £600 v £900

Save £500 and buy secondhand? I already run 650b Fox forks and Im running my rims/tyres until I can afford to upgrade to 650b fully. Will I die running 26’er in a 650b frame? No, just a tad low slung frame IMO as I run big Maxxis tyres anyway to compensate…

(Edit: be constructive. If I buy new I keep as I hate depreciation)

What ride (singular intentional) will you take it on?

Tyre kicker