I can echo what Ross said. Having a PGMO kit at Level 5 is no sign of big headedness. In my opinion, it is all about how you look to anyone. First impressions count a lot in this game and having a smart kit is one of them. I would never veer off from wearing my PGMO kit if you paid me, it looks smart and gives everyone the impression you know what you're doing.
Not trying to demean the other kits (RA, Legea etc) but for me, Umbro is the only choice in terms of looking the part. Yes it is quite a vast expense, but if you want to stick at it, i'd pay the money. Also ring your CFA, they might be able to get it cheaper if you get a county badge on the kit aswell. I got a full kit with county & FA badge last year for £75, considerably cheaper than A&H!