saving money vs set

[DickieBets]

When he min raised me on flop - I figured I was beat - what is the best course of action to tell for sure? I don't like calling because I don't really learn anything - but maybe I'm wrong. I figured betting out and folding to a push but if he calls then I'm not sure what to do. What's a good amount to bet, assuming that's the correct line?

Poker Stars, $0.10/$0.25 NL Hold'em Cash Game, 4 Players
LeggoPoker.com - Hand History Converter

SB: $61.50
BB: $4.65
Hero (UTG): $29.65
BTN: $25

Pre-Flop: K[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/heart.gif[/img] dealt to Hero (UTG)
<font color="red">Hero raises to $1</font>, BTN calls $1, 2 folds

Flop: ($2.35) 7[img]/images/graemlins/club.gif[/img] 8[img]/images/graemlins/heart.gif[/img] K[img]/images/graemlins/spade.gif[/img] (2 Players)
<font color="red">Hero bets $2</font>, <font color="red">BTN raises to $4</font>, <font color="red">Hero ???</font>