I would rather have 1 hi capacity shotgun than 3 section2, three shotters. 3 hicap shotguns is even better - if you want to start a collection. Getting an FAC to take up PSG is not particularily too much hassle. PSG itself is a learning curve and being adept with ones firearm is a skill highly valued. Knowing the abilities, strengths & weaknesses of the said weapons system and having the mental programming to use & sort issues with it under pressure is highly recommended.
getting a section 1 licence is not much more complicated than a section 2 one. You just need 2 referees instead of 1 and you need a seperate ammo safe if you stock slug shells(although not necessary to have or use slug) It is however a more likely route to avoid licence application woes - to aquire the Section 2 licence first and and then to go for the section licence maybe the following year. On the flip side of this - if you are attending a club and have joined after so many visits that they will stipulate, then applying straight for the section 1 licence should pose no problems. In this case a section 2 first would be a waste of money & time.
You can purchase & fit the gun cabinet after the initial application for a firearms licence, once you have passed the initial vetting the firearms officer will contact you to arrange a visit to your premises to inspect your gun safe & dwelling security. This way you can avoid buying a cabinet initially if you are worried about being passed by the vetting procedure. You will have time between the officer contacting you and the appointment date to sort this if you get on with it.
Being in a club is one surefire way to get your licence application accepted and it has other benefits, like other experienced shooters to learn from, possibly a training program, club insurance, access to knowledge of all equipment & where to the the best places to buy it. You can usually purchase firearms & shotguns & other related equipment from other club members a lot cheaper and you can club together to purchase ammo & consumables at reduced rates. The clubs have close links with firearms dealers and a working relationship with the police forces. Going the club route is respected by other disciplines & the authorities alike as being a responsible law abiding way to pursue legal use of firearms.
By having a licence, I have no worries about being involved with the legal firearms fraternity. It massively increases my exposure to kit, firearms, ammo, knowledge and everything else involved with the hobby. Therefore I am in a position to take in what I need as & when and store it in my prep archive.