THe LMC662 is an OLD CMOS replacement for the LM324,358 series that will swing rail to rail, works well from a 5V and the inputs work down to ground on a single ended supply. It's inexpensive, easy to use and draws about 10% of the supply current that a '324 or '358, further when I was using them in quantity (2008) everyone was sourcing them and at about $0.50 in 1K quantities (as I remember, could have been 10K) point is that they are easy to use and should certainly fill the bill. The only consideration would be input bias current, it doubles about every 10deg. C most of those breed did, Including the AD620 as I remember, The input transistors were J-Fet's in a lot of the high input impedance op-amps. The AD620 is a full IA and used for many different applications. Extremely difficult to use properly as although the gain figures are high the components required to achieve accurate gain are costly and require special treatment AND a Bi-Polar +/- 12V PSU too. The output is not rail to rail and will swing to a volt or so of either rail... Cool 80's era IA device but severely dated and still likely expensive as well as more education than you are likely to need... Yet.. IMO.
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