I know its a very basic marker but I got it for next to nothing from a friend and want to turn it into something decent. So I put a pump kit on it and wondering what I can do now to increase performance
You can switch out the HPR, LPR, ram, frame, ASA and barrel. You can't go electronic because of the 3-way being integrated into the vertical asa. Not much else you can do to it.
I usually go for the best my budget allows. Of course, price doesnt necessarily determine quality but it often does. You could buy new but you could also buy a high quality reg (like the 2-liter) that is older but kicks.
Are you kidding? Buy a $15 used Evil Detonator reg and call it a day. They work great, and since it's a pump, the fancy regs with quicker recharge rates won't make any difference.
You can pick up a CP shorty/long regulator for around $45 shipped from several forums like MCB, CC, or E-Bay. A stock WGP regulator works fine too. You can slap a Eblade on your Trilogy, it'll take some modding if your up for it.