The answer on your question depends on the type of work you do. If you are more an electrician than a micro controller hacker then your need for multimeters will differ.
If you want to have a couple of multimeters to do anything possible then you need a meter that can handle house electrical and maybe power distribution, and a meter that an handle low capacitance, fast continuity, fast update, low resistance, micro amps, and all the other usual electronic needs. You can find one meter to do it all of course, but you say you don't want to spend a ton of money. How much money? You really don't specify.
I agree that two meters is more than two times better than one. It opens up so many more measurement options. Actually, as Dave has said many time, it is probably better to have four meters. But you want tow so lets go there.
Maybe we can discuss different price ranges?
If you only have $50 to spend on two meters, then forget anything safe. I would personally recommend the UT136X series. The UT136B gives you a basic multimeter with capacitance, and the UT136C gives you temperature. They should only be used on the bench and automotive.
You have $100? Then I would probably recommend the UT139C as it gets you a fairly safe meter. The second meter maybe the Digitek DT4000ZC or a UT61E. They both get you PC recording but aren't really that good for safety.
$200? I would step up to a Brymen BM257 and any of the above to meet your tastes.
Above $200 the options get much wider. Perhaps you want a clamp meter but most people don't have a need for one.
This is just a start of the possible combinations and from just my viewpoint.