I NeeD HeLp PLease AM882 a good choise

[Jonathan]

I bought the screws today, one less thing. Jonathan I can only buy in aliexpress and eBay

Then you're basically stuck if you want them for a reasonable price. Will CNC4YOU not ship to your country? If not, then you need to find 3Nm (425oz-in) motors with 3.2mH phase inductance. They generally have 4.2A current rating.

And about the Linear Motion they offer me a similar exchangeable for u$s 622 usd instead of the hgr15 for 850 uss, what do you think? should buy it or go for hgr15?

It sounds like they're offering you a different brand of rail, e.g. LG or TBI, which is probably fine. Not many people here have bought them yet, so it's hard to compare the quality and even then the differences are likely to be so small it's hard to quantify. The TBI brand rails I got from aliexpress seem fine, so next time I need some I doubt I'll get Hiwin.