MP5-N and HK23E-K
USP9 with a LEM Match Hybrid trigger is perhaps the best trigger for a HK pistol (IMO) and you can mod a V1 or V7 for under $125. That's what I did on my USP9 Tactical and will be buying a second someday, but just as a plain USP. The VP9 is a very good trigger and the best among striker fire pistol on the market. The P30 V1 or V2, which is a LEM trigger (light vs heavy) has much to be desired.