Remember your starting point - by all means buy a mint gun with original everything. It will be more desirable to everyone - but they won't be able to afford to buy it!
Sleeving is a compromise. It can be a very good compromise.
Very few people can buy guns from retailers and make money on them- I would not recommend laymen to get involved in speculating and making money from buying guns.
Buy what you can afford, buy what you personally like, can shoot and want to own. Buy with some awareness and take advice. I doubt you will lose money in the long term. Keep chopping and changing guns bought retail and you will likely lose money.
Guns hold their value in proportion to where you started. Sure gun with original barrels will be worth more in five years - but it will cost you more now.
If I sleeve the gun it will be affordable and beautiful. If I re-barrel it, it will be beautiful but too expensive. If I can rescue the existing barrels - happy days!
