Hi, Pathtoyorsoul...
This is just my opinion....well, it's the opinion of lots of folks...but if the firearm you select is so heavy that it requires a gun belt to properly support it, then there is a fair chance that you eventually find reasons to NOT carry it. (That opinion will upset a lot of dedicated CCW folks, but it's one of the reasons this whole .380 pocket pistol craze has taken off, despite the defensive limits of the .380 cartridges. Go to YouTube and type in "nutnfancy guns"...for some example reviews.)
I agree with the posters about first learning to fire with the gunsights. Having said that, my pocket S&W revolvers and my 1911 Kimber wear Crimson Trace lasers, just 'cause I like variety in all things, and because installing them on those pieces did NOT require a special holster. As a rule, if you mount a flashlight and/ or laser on the tactical rail, then you will be forced to find and special order a kydex or leather holster that accomodates that specific rail mounted device. I had a Springfield XD Compact with a Streamlight Light/ Laser combination...and after adding a good Kydex Holster to contain it all, the whole package was just way too bulky for concealed carry. Plus, within a year, that Streamlight was obsolete.
There are some great concealed carry holsters on the market, but when it comes time for you to get all busy with sliding a heavy belt through double loops, and tucking in the shirt, and adjusting the holster position, and moving it around in my pants, and looking in the mirror to check if you're "printing"...EVERY day... then it gets to be a PITA. ...and here come the excuses to not carry the larger pistol.
Plus...as the other posters have alluded, rail-mounted lights will probably not be as bright as a good pocket flashlight. Like the 35 dollar Surefires I carry every night when I walk the dogs are way bright and reasonably priced.
Anyway...maybe go to the Crimson Trace website and kinda take a look at their images of handguns wearing a CT laser. Some installations are just plain UGLY to behold..and I don't do ugly.
Alsos...there are some firearms that have nightsight options..for a price. But, then you get into the debate of... if it's too dark for you to see your gunsights, then it's too dark for you to be shooting at a human being that you can't identify as friend or foe.
Anyway...in 40 caliber, there are lots of great products that are not too large for daily carry...Glock 27, Kahr MP40, S&W M&P Sub-Compact, Springfield XD40, the list goes on...
BTW...some of those pistols are kinda blocky (like the Springfield XD40) which again makes them a challenge for daily carry.
Anyway...enough of my rambling.
Have fun with your purchase!
Robt.