Well Phasecorrect, you are looking at about a $30 cartridge in the Elan, and about a $45 cartridge in the Elektra. Both very budget MM types. The Sumiko Oyster is about in the middle, price wise, at about $40. They are all what you might call "throw-in" cartridges that don't cost the mfr hardly anything, and they can include them on a table that is ready to go.
If I had to take my choice, I'd go with the Elektra.
Now, VTA adustment. On entry level tables, you are not going to have any. On the NAD, which will have a Rega arm, you can get one for about $40. The idea is to adjust the stylus "rake" in the groove, so that the cartridge will have the proper frequency balance, tracking, and overall sound. You have to do this by ear, although setting the arm level when playing is a good starting point. Then you move slightly up or down to achieve the sound you want. These low priced tables and cartridges may not be very responsive to such adjustments, but it wouldn't hurt.
If I had to take my choice, I'd go with the Elektra.
Now, VTA adustment. On entry level tables, you are not going to have any. On the NAD, which will have a Rega arm, you can get one for about $40. The idea is to adjust the stylus "rake" in the groove, so that the cartridge will have the proper frequency balance, tracking, and overall sound. You have to do this by ear, although setting the arm level when playing is a good starting point. Then you move slightly up or down to achieve the sound you want. These low priced tables and cartridges may not be very responsive to such adjustments, but it wouldn't hurt.