A glock of wheelguns ( you must mean ugly and plastic ?? )..
No, ok.....in new wheelguns, under $500 - its mostly junk in my opinion.
In used wheelguns, yes....there is the S&W model 10 ( .38 spl ) ...definitely under $500 . Another couple of guns to look for are S&W model 19's ( K or medium sized frame) or model28's ( N frame or large) ...both in .357 mag...and you'll find some with cosmetic scratches, holster wear, duty guns - carried a lot, fired very little - for under $500.
The pre -Model 10's were parkerized - there are a lot of them around for $ 150 or so ...and the newer model 10's & 19's and 28's were blued or nickel.../ look for a blued one for value. A model 28 ( N frame ) in .357 mag - and you can shoot .38 spl's in it too ...is a very solid gun / they called them The Highway Patrolman ....and a lot of model 10's, 19's and 28's were carried by Federal law enforcement, sheriffs, etc especially in the western US.
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Before you buy - you need to shoot some revolvers...Taurus, Ruger, S&W, etc....in .38 spl and .357 Mag....and see what you like...the triggers on the S&W's will be some of the best you'll find - new or used. Ruger is not a terrible gun .../ Taurus has some reliability and durability issues, in my view...but they have their fans as well.
A good revolver in a 4" barrel is a really good defensive weapon in my view...maybe 6" if you're not going to carry it / keep it at home in a dresser or something...